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Corolla 5-fida, purpurea ; tubus 2*5-3-5 mm. longus, sparse
glanduloso-pubescens ; lobi 2-2*5 mm. longi, lineares, acuti,glabri,
stylo subaequantes vel paullo breviores. Achaenia 1*5 mm. longa,
obovoidea, leviter curvata, 5-sulcata, glabra. Pappi setae 1-1*5 mm.
longae, caducae, scabrae.

Rhodesia. Manika District; Inyanga Mountains, 1800-2100
mm., E. Gedly 227a.

838. Vemonia bothrioclinoides, O. fl. Wright [Compositae-Ver-
noniaceae] ; ex affinitate V, karagiiensiSy Oliv. et Hiern, recedit
bracteis longioribus recurvis, achaeniis tricostatis et pappo
Uniseriato.

CauUs suff rutescens, leviter costatus, pubescens. Folia oblongo-
lanceolata, acuta, 6 cm. longa, 1-2 cm. lata, supra scabra vel
scaberula, subtus tomentosa, marginibus plus minusve crenulatis.
Capitula 6-8 mm. diam., plurima, corymbosim disposita. Bracteae
oblongae, acuininatae, recurvae, longiores 6 mm. longae, 1 mm. latae,
exteriores sensim minores, apice purpureo-tinctae, extus pilosae.
Corolla purpurea, 4 mm. longa, extus pubescens, lobis oblongis.
Achaenia piano-con vexa, tricostata, inter costas pubescentia.
Pappus uniserialis, corollsB sequilongus, scaber.

British Central Africa. Nyasaland ; Namasi, Cameron^
40 ; Mount Chiradzulu, Whyte,

839. Vemonia mashonica, A^. E. Brown [Compositae-Ver-
noniaceae] ; species distinctispima ex affinitate F. senegalensiSy
Less.

Frutex ramosus, ad 1 m. usque altus. Rami angulati, glabri vel
subpruinosi. Folia altema, 1*5-2*5 cm. longa, 2-10 mm. lata,
oblanceolata vel spathulato-oblanceolato, obtusa vel subacuta,
Integra vel 1-2-dentata, coriacea, utrinque glabra, glandnloso-
punctata, reticulate- venosa. Gyma>e plures, sublaxae, corymbosae.
Capitula pedicellata, 5-flora, circa 1 cm. longa, 6 mm. diam., alba.
Involucri campanulati bracteae quam flores duplo breviores,
oblongae vel elliptico-oblongae, obtusae, brevissime mucronatae,
pubescentes, stramineae, apice viridi-notatae. Corolla 5-dentata,
glandulosa ; tubus 5 mm. longus, angustissime infundibularis ;
dentes 2 mm. longi, lineari-attenuati. Ovarium dense glandu-
losum; stigmata filiformia, hirtella. Pappi setae coroUo sub-
aequantes, niveae, scabrellae.

Rhodesia. Mashonaland; common at. Salisbury, Hon. Mrs.
Evelyn Cecily 70 ; at Umtali, E. Cecil, 229.

840. Pteronia flordida, N. E. Brown [Compositae-Asteroideae] ;
affinis P. glomeratae, Linn, f., sed capitulis brevioribus, squamis
involucii angustioribus et oortice cinereo differt.



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109

Frutex nanus, ramosas, cortice cinereo. Folia oppoeita, fasci-
cnlata, 1-5 mm. longa, O'5-l mm. lata, lineari-trigona vel subteretia.
Capitula terminalia, solitaria, 1-1*5 cm. loDga, 6-8 mm. diam.,
5-9 flora. Involucri aqtiamae Bnbqninqueseriatae, interiores
1 cm. loDgae; 2-2*5 mm. latae, lineari-oblongae, obtneae, exteriores
gradatim. minores, apice doreo gibboso-dentatae, virides, mem-
branaceo-marginatae, snbnitidae. Corolla 8 mm. longa, tubnlosa,
basi contracta, apice 5-dentata, glabra; denies 2 mm. longae,
lioeari-oblongae, acntae. Ovarium pilis longis albis appressis
dense vestitnm. Pappi setae nnmerosissimae, lutescentes, exte-
riores breviores.

Capb Ck)LONY. Middelburg Division, 1100 m., Gil/Ulan in
Herb. Oalpin, 5527.



XIX.-PEESIAN &UM.

{Amygdalus Imocarpa^ Boiss.)



From time to time consignments of gum of dissimilar character
appear in the commerce of this country as Qum Arabic, not the
least interesting being the subject of this note. Little appears to
have been -written regarding this product however, but the following
details gathered from the Pharmaceutical Journal^ March 29th,
1890, p. 793, may be quoted, not only as throwing light upon the
subject, but also as an illustration of the diflBculty frequently
experienced in determining the geographical as well as the botani-
cal sources of a trade product. Quoting as his authority Professor
E. Sickenberger, the writer of the note referred to says that it
appears that quantities of this gum " are sent from Bushire, either
" to a small port on the west coast of the Red Sea or to Jedda, in
" order that it may be substituted for Kordofan gum. It is thence
" conveyed to Assouan and packed in old Kordofan packages and
" sold as genuine gum. Owing to its pale colour and the absence
" of any suspicion that the gum from Assouan could be other than
" good Gum Arabic, a considerable amount has been sold. The gum,
" however, is described as not soluble in water, but only swelling
*^ up in it, and as being less brittle than Kordofan gum. Professor
" Sickenberger suggests that this Persian gum may be the produce
"of Pruniis hokharimms^ Royle, and Prunus Puddum^ Roxb.
" The specimens of Persian gum that have appeared in the London
*^ market resemble East Indian or Senegal gum of good colour
" rather than the white minutely cracked Koi^of an gum."

With regard to the suggestion that this gum may possibly be
derived from P. bokhariensis and P. PuddutHy it may be well to
state here that the Herbarium contains no specimens of the first
mentioned species, and as far as can be ascertained there is no
published description of it. In Hooker's Flora of British India^
Vol. II., p. 315, it is placed under P. communis^ Huds., var.
insititiOj with the following note : — ** I have seen no specimens
" of Royle's P. aloocha and hokharien»iSy but have no reason to
** doubt that they are referable to this."



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110

In response to an application made to the India Office, samples
of the gums of P. Puddum and P. communis were collected in
the Panjab and forwarded to Kew in Jnly, 1890. These bear
little resemblance to the Persian gum, though ihej agree with it
in being insoluble in water.

The Museum contains three samples of Persian gum, all
apparently identical. The oldest sample was received as " Wild
Almond Gum ^^ so long ago as August, 1854. Another sample
formed part of 25 bags of " Persian Gum Arabic " imported from
Bagdad and included in the London Drug Sales of June 9th, 1893.
The third sample was collected by Dr. 0. Stapf in 1885, who says
of it : — ^* I may add that I saw a kind of cerasin (gummi nostras)
'' being sold in the bazaars at Shiraz for medicinal purposes. It
"was called Ketirah-i-Arjen and stated to be derived from the
"Arjen shrub {Amygdalus leiocarpa, Boiss.). Later I myself
" collected it from this species on Kuk Chah Sia, north of Shiraz,
" where it was plentiful on the ground underneath a few shrubs
^ and also on the stems. A sample of it is in the Museum. It
" looks externally very like Gum Arabic. The same kind of gum
" is also sold at Kirman under the name of * DjUbd i Ardjan,'
" whilst it is replaced by the gum of a plum (^ Samgh-T-dlutschkh')
" and of a cherry (* Samgh T gilds ') in Ispahan." {See Andreas
und Stolze in Peterm. Geogr. Mitth. Erganz., B. XVII., II., p. 15.)

From the notes and material obtained by Dr. Stapf it is evident
that some if not the greater part of the Persian Gum of commerce
is derived from Amygdalus leiocarpa^ Boiss.

In the Diplomatic and Consular Report on the trade of Bushire
for the year 1905 it appears that there is an increasing export of
gum from that port, as the following figures show : —



1903.



Gam



Value.
£38,016



1904.



Value.
£04,869




£6,080



J. M. H.



XX.-PERPBTUATION OP " POTATO DISEASE '^
AND POTATO "LEAP-CUEL" BY MEANS OP
HTBEBNATINO MTGELIUM.

The sudden and simultaneous appearance of '^ Potato-disease,"
caused by Phytophthora in/estans, De Bary, over widely extended
areas in Britain and other countries has hitherto been attributed
to the rapid production and diffusion of spores during a period
when special meteorological conditions favoured the rapid
development of the fungus.



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Ill

ThiB explanation, however, when carefully considered, proves
to be altogether inadequate. When a potato plant infected with
the spores of PhyiopMhora is placed under a bell-jar in a very
damp atmosphere, subdued light, and high temperature — condi-
tions most favourable to the development of the parasite — ^it is
only after a period of four or five days that the fungus produces
fruit on the leaves, and then only at the points of infection. On
the other hand the fact is too well known that a field of potatoes
or all the potato fields in a certain district which at a given
moment appeared perfectly healthy and vigorous, have, under
certain climatic conditions, been reduced to a blackened, decay-
ing, foetid condition within 24 hours. Again, in the case of every
fungus epidemic proved to be due to the diffusion of spores, the
disease always originates from one or more primary centres of
infection, and gradually extends, whereas in the case of potato
disease the appearance of the epidemic is often simultaneous over
a considerable area.

These considerations suggested the existence of some method
other than dissemination by means of spores as the cause of such
sudden outbreaks of disease. The presence of mycelium can
readily be demonstrated in the tissues of diseased potato tubers,
and a series of experiments conducted at Eew have conclusively
proved that such hybernating mycelium in a tuber is capable,
under favoijunble conditions, of perpetuating the disease.

Three diseased potato tubers showing rusty stains characteristic
of the presence of Phytophthora mycelium in the flesh were each
cut into two equal parts. Each half tuber was planted separately
in a plant pot ; the same kind of soil and manure, sterilized by
steam, was used in all the experiments. Three of the pots were
placed in a house having a temperature ranging between 70^ and
80° Fahr., in dull light, and with the moisture often at saturation
point. Each pot was placed under a bell jar. The three remain-
ing pots were placed in a well-lighted house, without any artificial
heat, and with an exceptionally dry atmosphere. These pots
were not placed under bell-jars. An equal amount of water was
supplied to each of the six pots. The three plants grown under
conditions of high temperature, dull light, and much moisture in
the air, showed the ^rst indication of Phytophthora when the
shoots were six weeks old, and a fortnight later the three plants
were blackened and destroyed by the f imgus.

The three plants grown in the cool, well-lighted, dry house
showed no trace of disease at the end of two months, when one of
the plants was removed to the warm house and placed under a
bell-jar. Within nine days this plant was blackened and killed
by the fungus. A fortnight later a second plant was removed
from the cool to the warm house and placed under a bell-jar.
Within a week of the removal of this plant it was also covered
with PhytapJUJiora. The third plant continued growing in the
cool house for 13 week, and remained perfectly free from obvious
disease.

Similarly marked results were obtained by using potato tubers
produced by a plant that was badly infested with potato ** leaf -curl '*



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112

(Macrosporlum solani^ Cooke), proving that this disease can
also be perpetuated by hybernating mycelium present in the
tubers.

The abOTO experiments, in addition to proving that the diseases
indicated can be transmitted from one generation to another by
means of mycelium present in the tubers, also demonstrate
another point of much practical importance, namely, that the
absence of obvious disease in a crop does not necessarily prove
the absence of such disease in a latent form.

In the experiments described above, it was known at the
commencement that the six half^tubers were all diseased. The
three plante grown in the hot, damp, badly-lighted house were
promptly destroyed, simply because the conditions indicated were
detrimental to the growth of the potato but highly favourable to
the rapid development of the fungus, which soon became
dominant and destroyed its host-plant. On the other hand, the
three potato plants in the cool house grew normally under the
lower temperature, less atmospheric moisture and better light, a
set of conditions very detrimental to fungus growth ; hence,
although the parasite was present, it remained entirely in abey-
ance, and the practical man would, without hesitation, have
pronounced the plants free from disease.

Every potato grower of experience can predict almost with
certainty the moment when potato disease will appear ; the
necessary conditions are warm, damp, dull weather, but instead
of the sudden outbreak being due to the rapid diffusion of spores,
as has hitherto been believed, it is far more probable that in the
majority of instances it is due to the existence of mycelium,
already present in the tissues, which had hitherto been prevented
from manifesting itself in an aggressive* form owing to the absence
of favourable climatic conditions.

George Massee.



XXI -NEW ORCHIDS. DECADE 28.

271. Masdevallia peruviana, Rolfe; afiBnis M. auropurpureo^
Reichb. f ., sepalorum tubo lato nee constricto, caudis brevioribus,
labello medio carinato, et colore florum distincta. .

Folia oblongo-lanceolata, subobtusa, 6-8 cm. longa, 1'5-1'8 cm
lata, basi in petiolum 2*5-4 cm. longum attenuata* Scajn subteretes,
6-8 cm. longi, 1-2-flori. Bracteae conduplicatae, late oblongae,
apiculatae v. obtusae, 8-10 mm. longae. Pedicelli 1-1*2 cm. longi.
Sepalorum tubum late cupulatum, 6-8 mm. longum ; lobus
posticus triangularis, parvus, cauda tenui, recurva 1*3-1"5 cm»
longa ; lobi laterales latissime ovati, ad medium connati, caudis
tenuibus, recurvis 7-9 mm. loi^is. Petala lineari-oblonga, apice
bidentala, 5-6 mm. longa. Labellum subpandurato-oblongimi,



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apice valide recurvum, apiculatum, ^I mm. longum, carinis
2 obliqois ad medium mstructis dein attenuatis et prope apicem
obBoletis. Columna clavata, 6 mm. longa, marginibns alatis.

Pbru. Collector unknown.

Flowered in the Royal Botanic Gardens, Glaanevin, in July,
1898, and on several subsequent occasions. The tube of the sepals
is light brown, the apex of the lateral sepals red-purple, fading
away to whitish near the base, and the petals and lip white tinged
with lilac.

272. Dendrobium (Stachyobium) compactum, Rol/e; affine D.
alpeslHy Royle, sed racemis brevioribus et densioribus, bracteis
latioribus, et labello minute crenulato, nee inciso-serrato, facile
distinguendum.

. Herha epiphytica, caespitosa, 4-5 cm. alta. Psetidobulbi fusi-
formes, 3-4 phylli. Folia oblonga, inaequaliter biloba, obtusa,
1*5-2 cm. longa, 3-5 mm. lata ; hEtsi vaginata, vaginis striatis.
Racemi terminales v. subterminales, 1*3-2 cm. longi, 5-6-flori.
Bracteae ovato-lanceolatae, acutae, 2-3 mm. longae. PedicelU
graciles, 4 mm. longi. Sepalum posticum oblongo-lanceolatum,
acutum vel acuminatum, 4 mm. longum ; sepala lateralia obliqua,
triangularia, acuta, 4 mm. longa, basi 4 mm. lata. Petala oblongo-
lanceolata, acuta v. acuminata, 4 mm. longa. LabeUum subtrilobum,
recurvum, 5 mm. longum ; lobus intermedins ovatus, apiculatus,
undulatus et minute crenulatus ; lobi laterales oblongi, obtusi,
margine minute crenulati ; discus obtuse bicarinatus. Columna
lata, 1*5 mm. longa. Mentum conicum, obtusum, incurvum, 5 mm.
longum.

Yunnan. Szemao ; Western Forests and Tea Hills, 1500 m.,
A. Henry, 11752 A, 12752.

Flowered in the collection of Madame Louis de Hemptinne, of
Ghent, in December, 1903. The flowers are white, with the lip
light green.

273. Dendrobium (§ Clavipes) annamense, Rolfe; afiine D. crtir-
nienato^ Swartz, floribus minoribus flavescentibus, labello integro
focile distinguendum.

Herha epiphytica. Gaiiles patentes vel subpenduli, graciles,
circa 4-5 dm. longi, prope basin dilatati et subcompressi. Folia
oblonga, obtusa, subcoriacea, 5-7 cm. longa, l'5-2 cm. lata. Flores
axillares, ad nodos laterales defoliatos fasciculati vel breviter
racemosi, saepissime triflori. Bracteae ovatae, acutae, submem-
branaceae, 2-3 mm. longae. PedicelU graciles, 1*3-1*5 cm. longi.
SS^poZum posticum ovato-triangulare, acutum, circa 1 cm. longum ;
sepala lateralia triangularia, acuta, basi ad columnae pedem in
mentum curvatum obtusum circa 1*3 cm. longum extensa. Petaia
lanceolate oblonga, subacuta, circa 1 cm. longa. LabeUum late
oblongum, obtusum, apice leviter crenulatum, basi subattenuatum,
circa 1*5 cm. longum ; discus laevis. Columna latissima, circa
2 mm. longa.



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114



Annam. MicholUz.



Introduced by Messrs. Sander and Sons, and flowered in their
establishment in March, 1906. The flowers are bufl^-yellow and
rather membranous.

274. Bnlbophyllom calabarioum, Bolfe ; affine B. recurvo, Lindl.,
sed labello facie papilloso et marginibns ciliatis facile distinguen-
dam.

Rhizotna repens. Pseudohulhi approximati, ovoideo-tetragoni,
1*3-2 cm. long!, monophylli. Folia oblonga vel lanceolato-
oblonga, subobtusa v. apiculata, coriacea, 4-7 mm. longa, 1*3-2 cm.
lata. Scapi suberecti vel arcoati, 7-13 cm. longi, mnltiflori.
Bracteae lanceolato-oblongae, acutae, 3-4 mm. longae. PedicelU
2 mm. longi. Sepala triangnlari-lanceolata, acuta vel subacuminata,
5-6 mm. louga. Petala oblonga, apiculata, minutissime papiilosiA,

2 mm. longa. Labdlum oblongum, subobtusum, camosum,
papillosum et ciliatum, recurvum, 1*5 mm. longum. Oolumna
latissima ; dentes subulati, acuti, vix 1 mm. longi.

W. Tbop. Africa. Old Calabar, Holland.

Sent to Kew by Mr. J. H. Holland, Botanic Oarden, Old Gala-
bar ; and flowered in the collection in October, 1899. The flowers
are light yellowish green, with a dull reddish purple lip.

275. Polystachya bicolor, i2o{/y? ; aP.|m/ywrea,Wight,pedicelH&
longioribus labelli lobis lateralibus supra medium afflxis, a
P. rosea^ Ridl., floribus multo minoribus diflEert.

Caules caespitosi, 2*5-5 cm. longi, 3-4.phylli, basi crassiusculi.
Folia lanceolato-oblonga, subobtusa vel inaequaliter bidentata,
4-9 cm. longa, 1-1*7 cm. lata. Scapi 7*5-10 cm. longi, vaginis
paucis obtecti ; panicula laxa, 2*5-5 cm. longa, multiflora, rachi
pubescente. Bracteae basi latae,apice acuminatae, 1-1*5 mm. longae.
PedicelU 4-6 mm. longi. SepcUum posticum ovatum, acutum,

3 mm. longum ; sepala lateralia obliqua, late triangularia, apiculata,
3 mm. lata. Petala obovato-oblonga, apiculata, 3 mm. longa.
Labelhcm 4 mm. longum, late unguiculatum, supra medium tri-
lobum ; lobi laterales oblongi, obtusi, 1 mm. longi ; lobus inter-
medins suborbicularis, obtusissimus vel minutissime bldentatus,
2 mm. latns ; discus omnino farinaceo-pubescens ; callus oblongus,
depressus, obtusus. Columna lata, 1*5 mm. longa. MerUum late
oblongum, obtusum, fere 3 mm. longum.

Sbtchellbs. Cascade Estate ; on rocks in mountains, common,
Thomassety 58.

A living plant was also sent to Eew, where it flowered in
September, 1903. The pedicels and sepals are light purple, while
the petals, lip and column are cream white. It is very distinct
from the two other Seychelles species.

276* Saooolabium mbesoens, Rolfe; a 8. ampiMaceoy Lindl., caule
altiore, f oliis latioribus et subrecurvis, racemis pedunculatis, sepalis
petalisque multo minoribus differt.



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115

Caulis erectos, robostas, circa 2*5 dm. alias. Folia patentia
Tel recur va, coriacea, oblonga, inaequaliter et brevissime biloba,
1'2-1'5 dm. longa, 2-5-3*2 cm. lata. Scapt suberecti, l-5-l'7 cm.
longi. Racemi 7*5-10 cm. iongi, moltiflori. Bracteas ovatae,
obtusae, concavae, 1 mm. longae. Pedicelli 1*8-2 cm. longi. Sepa-
lum posticum late ellipticnm, obtusum, vix 4 mm. longum ; sepala
lateraiia ovata, qaam posticum latiora. Petala late elliptica,
obtusa, vix 4 mm. longa. Laibeilum trilobum; lobi laterales
transverse oblongi, obtusissimi, incuivi, breves ; lobus intermedins
ovato-oblongus, subacutns, basi patens, apice incurvus, 1 mm.
longus ; calcar strictum vel subincurvum, 1 cm. longum. Oolumna
brevissima.

Annam. Micholitz.

Imported by Messrs. Sander and Sons, in 1903, and flowered at
Kew in March, 1906, and shortly afterwards at Glasnevin. The
flowers are uniformly light rose-purple in colour.

277. Saroanthus inflatos, Bolfe; a speoiebus reliqnis labelli
calcare inflate segmentis multo longiore differt.

Folia angusteoblon^^a, crasse coriacea, apice inaequaliter et obtuse
biloba, 6-12 cm. longa, 1-1*5 cm. lata. Panicula 9-12 cm. longa,
multiflora. Bracteae late ovatae, subacutae, 1-2 mm. longae. P^i-
ceUi 7-8 mm. longi. Sepala late oblonga, obtusa, 3 mm. longa.
Petala oblonga, obtusa, 3 mm. longa. Labellum camosum, tri-
lobum ; lobi laterales triangulares, subacuti, 1*5 mm. longi, apice
incurvi; lobus intermedins triangularis, subobtusus, 1*5 mm.
longus ; calcar inflatum, ellipsoideo-oblongum, obtusum, lateribus
subcompressum, 5 mm. longum. Columna latissima, 1*5 mm.
longa ; pollinarii glandula hippocrepiformis.

Annam. MichoUtz.

Introduced by Messrs. Sander and Sons, and flowered in the
Royal Botanic Gardens, Glasnevin, in April, 1906. It belongs to
the group with bilobed leaves and paniculate inflorescence, but
owing to the disproportion between the spur and the rest of the
flower, cannot well be compared with any other species. The
sepals and petals are green, with a pair of dark brown stripes, the
front lobe of the lip light yellow, and the side lobes white, with a
purple stain on the side next the column, which extends down
the underside of the lip, terminating in a pair of radiating veins.

278. Listrostaehys fimbriata, Rolfe; species L. fragrantissimaey
Reichb. f., simillima, sed labelli calcare longiore et tenuiore &cile
distinguenda.

Folia pendula, anguste oblonga, inaequaliter biloba^ obtusa, basi
paullo attenuata^ coriacea, circa 3-3*2 dm. longa, 4*5-5 cm. lata.
Racemi penduli, circa 3, dm. longi, multiflori. Flores oppositi.
Bracieas' cOnnatae, tubulosae, i mm. longae, apice apiculatae vel
fere truncatae. Pedicelli 5 mm. longi. Sepala ovato-lanceolata,
acuminata, 1-1*5 cm. longa. Petala similia sed minora, margine
erosa vel subflmbriata. Labellum late panduratum, 1-1*3 mm*



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116

longum, 7-8 mm. latum, apice trilobum ; lobus intermedins longe
acuminatuB ; lobi laterales stibdolabriformes, fimbriati ; calcar
pendulum, basi gracile, dein subito unilateraliter inflatum, apice
attenuatum, subobtusum vel apiculatum, 1-1*3 mm, longum, circa
2 nmi. latum. Colutnna latissima, 2 mm. longa.

E. Trop. Africa. Uganda, Entebbe ; " not very common,'*
Mahotij 5.

Dried and living specimens were sent to Kew by the late
Mr. John Mahon, Curator of the Uganda Botanic Station. It has
since flowered in the collection. The flowers are translucent
white, with a slight greenish tinge. The collector describes it
as very floriferous.

279. Mystaoidiom Mahoni, Rolfe; affine M, xanthopoUiniOj
Reichb. f ., sed labelli calcare valde incurve limbum parum exce-
dente facile distinguendum.

CauZi8 el ongatus, scandens, 4 mm. diam. ; intemodia, 1*3-2 cm.
longa, radicantia. Folia linearia, apice breviter et inaequaliter
biloba, 7'5-ll cm. longa, 6-9 cm. lata, subcoriacea. Bacemi
graciles, 7*5-10 cm. longi, subflexuosi, multiflori. Br(icteae latae,
tubulosae, subtruncatae, 2 mm. longae. Pedicelli 2-2*5 mm. longi.
Sepaln elliptico-oblonga, obtusa, fere 3 mm. longa. Petala orbi-
culari-ovata, obtusa, fere 3 mm. longa. Labellum late obovato-
flabellatum, obscure trilobum, minute crenulatum, 3 mm. longum,
4 mm. latum ; calcar lineari-oblongum, obtusum, incurvum, circa
4 mm. longum. Columna lata, 1 mm. longa ; rostellum triangulare,
acutum, 1 mm. longum.

E. Trop. Africa. Uganda ; Entebbe, " grows in large inter-
woven masses,'' Mahon^ 7.

Described from dried specimens sent with the preceding.

280. Vanilla zanzibarica, Rolfe; a V. africana^ Lindl., foliis
elliptico-oblongls apice latis, a F. crenulata^ Rolfe, labello majore
marginibus ad columnam supra medium adnatis differt.

Gaulss subgraciles, scandentes ; intemodia 5-9 cm. longa. Folia
elliptico-oblonga, breviter acuminata et subobtusa, 7-11 cm. longa,
3-5 mm. lata, coriacea, venis prominentibus. Ra^cefni axillares,
simplices, circa 2*5-3 mm. longi, multiflori. Bracteae ovatae, sub-
obtusae, patentes, 2 mm. longae. Sepala elliptico-oblonga, sub-
obtusa, 2-2*5 cm. longa, 10 mm. lata. Petala oblonga, subobtusa,
2-2*5 mm. longa, 8 mm. lata. Labellum prof unde trilobum ; lobi
laterales truncati, 1-1*3 cm. longi, apice denticulati, marginibus
columnae adnatis tubum latum subsaccatum formantibus ; lobus
ihl^rmedius late triangulari-ovatus,subobtusus, 1 cm. longus, 9 mm.
latus, subconcavus ; crista retrorsa, e f oliolis ramentaceis fimbriatis
imbricatis composita, linea mediana paullo incrassata supra cristam
obscure 3-carinata, infra cristam obscure 5-carinata. Golumfia



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