79 | MALAXIDEJE.. DENDROBIEE. 
I know this genus chiefly by Blume's figure and description. It seems 
to differ from Aporum in nothing but having two pollen masses instead of 
four, and in the presence of a tubercle below the tip of the lip on the under 
side. I have not been able to satisfy myself upon the first point, in exa- 
mining the flowers of Dr. Wallich's specimens of O. carnosum ; but I 
presume Dr. Blume's observations, made upon fresh flowers are accurate 
as to this. 
1. OxysTorpHyLLUM carnosum. Blume. 
O. foliis lineari-lanceolatis acuminatis subfalcatis, racemis lateralibus pa- 
leis imbricatis distichis vaginatis, labello cuneato supra tomentoso : tu- 
berculo apicis minuto, petalis erosis. 
Herba supplex prima. Rumphius 6. t. 50. f. 2. 
O.carnosum. Blume l. c. t. 38. 
Aporum concinnum. Lindl. in Wallich. Cat. Herb, Ind. no. 2019. i 
Hab. in sylvis montium Jave, florens Julio, &c. Blume ; Amboyna, Rumph. 
Wallich. (habeo s. sp. e Museo Anglo-Indico.) 
Flores parvi coriacei. Sepala in sicco acuta, in vivo obtusiora (ex Blumii 
icone). Herba erecta, cespitosa, palmaris, caulibus simplicibus, ad 
basin usque foliosis. 
I originally considered this a species of Aporum, not having been able 
to procure any flowers; the examination of one or two withered blossoms 
has since enabled me to ascertain that it is the Oxystophyllum carnosum 
of Blume. Rumphius's figure is characteristic. 
2. OxvsroPHYLLUM rigidum. Blume. 
O. * foliis strictis coriaceis, labelli tubertulo obtuso." Blume p. 336. 
Hab. in sylvis montium Salak, Pantjar, &c. Jave, florens toto anno; Blume. 
3. OxysTOPHYLLUM excavatum. Blume. 
O. * foliis rectis subcoriaceis, labelli limbo intüs excavato extüs convexo." 
Blume l. c. 
Hab. in sylvis altioribus montis Salak, Jave, florens Decembri; Blume. 
XLV. POLYSTACHYA. 
Polystachya. Hooker Exot. Fi.103.. 
Sepala erecta, acuta: lateralibus majoribus cum basi producta column& 
connatis. Petala minora. Labellum sessile, cum basi producta co- 
lumne articulatum, trilobum. Columna semiteres, brevis. Anther? 
bilocularis. Pollinia 4, collateralia, zqualia, per paria coherentia.— 
Herbz epiphyte caulescentes nunc pseudo-bulbose. Folia leviter ner- 
vosa. Flores paniculati, parvi, alabastris trigonis. 
When I published the type of this genus in my Collectanea Botanica, in 
1821, I had seen only imperfect pollen masses ; one lying in each cell 0 
the anther. Subsequently Dr. Hooker, in founding the genus in his Exotic 
Flora, represented them adhering to a common pedicel and gland, 4 in num 
ber, and not lying side by side, but upon each other. Finally M. Achille 
Richard, in his account of the Mauritius Orchideous plants, states the 
number of pollen masses to be 2, without any stalk or gland. All these 
observations are however inaccurate, as I have recently satisfied mys¢ 
