thus is illegitimate for it represents a later homonym. 
Between these two dates, in 1825, Blume _ published 
Cleisostoma in the Key to genera of Javanese orchids is- 
sued with part six of his Bijdragen, and illustrated its 
salient features on figure 27 of his Tabellen under C/le?- 
sostoma sagittata. Hence, this species must be regarded 
as the type of the genus. 
One of the main characters of the genus is the large 
callus on the backwall of the spur of the lip, which is 
more or less grooved, and, either alone or in conjunction 
with other excrescences at the base of the main lamina 
of the lip, completely closes the entrance to the nectar- 
iferous spur. Column short and stout, often pyramidal, 
t.e., wider at base, footless or with distinct foot. Pollinia 
2, each unequally split in halves, on distinct stipe. The 
stipe shows a remarkable variation; it may be rather 
slender, linear with a small, subglobose viscidium or it 
may be triangular or broadly rectangular and attached 
to a horseshoe-shaped viscidium. It seems that the two 
types of pollinia are closely associated with the presence 
or the absence of a column-foot, but whether this holds 
throughout the genus is pending further studies. 
Cleisostoma arietinum (Rchb.f.) Garay, comb. nov. 
Basionym: Sarcanthus arietinus Rebb.f. in Gard. Chron. +16, 1869. 
Cleisostoma aspersum (Rchb.f.) Garay, comb. nov. 
Basionym: Sarcanthus aspersus Rehb.f. in Hamb. Gartenz. 21: 297, 
1865, 
Cleisostoma auriculatum (Rolfe) Garay, comb. nov. 
Basionym: Sarcanthus auriculatus Rolfe in Kew Bull. 9, 1895. 
Cleisostoma Beccarii (Schltr.) Garay, comb. nov. 
Basionym: Sarcanthus Beccari Schltr. in Notizbl. Bot. Gart. u. 
Mus. Berlin 8: 20, 1921. 
Cleisostoma belophorum (Rchb.f.) Garay, comb. nov. 
Basionym: Sarcanthus belophorus Rehb.f. in Gard. Chron. n.s. 20: 
262, 1883. 
Cleisostoma bicorne (J.J.Sm.) Garay, comb. nov. 
Basionym: Sarcanthus bicornis J.J.Sm. in Bull. Dep. Agric. Ind. 
Neerl. 19: 35, 1908. 
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