Basionym: Saccolabium pachyglossum Lindl. in Journ. Linn. Soc. 3: 
834, 1858. 
Schoenorchis tortifolia (Jayaw.) Garay, comb. nov. 
Basionym: Saccolabium tortjfolium Jayaw. in Bot. Mus. Leafl. Harv. 
Univ. 20: 111, 1963. 
Seidenfadenia Garay, gen. nov. 
Type: Aérides mitrata Rchb.f. 
Etymology: In honor of Dr. Gunnar Seidenfaden, 
career diplomat and scientist whose recently published 
four-volume treatise on the Orchids of Thailand is a 
storehouse of information. 
Sepala petalaque libera, subaequalia plus minusve 
similia, patentia vel reflexa. Labellum basi columnae 
continuum, lobatum; lobis lateralibus minutis, cornicu- 
latis, lobo intermedio prominente planiusculo; calcar 
lateraliter compressum, a latere viso semilunatum, ob- 
tusum, intus ecallosum, sed utrinque carina a pariete 
superiore antice oblique fundum versus descendente do- 
natum. Columna humilis, crassa, basin versus sensim 
dilatata, pedem obscurum formans. Clinandrium dor- 
sale. Stigma reniforme ad basin columnae. Rostellum 
erectum, bidentatum, carinatim elevatum. Pollinia 2, sul- 
cata, stipiti lineari-spathulati affixa; glandula prominens. 
Plantae epiphyticae; caulibus satis abbreviatis, vagi- 
nis foliorum approximatis omnino obtectis; foliis articu- 
latis, semiteretibus, suleatis; inflorescentiis axillaribus, 
pendulis, laxe racemosis, multifloris, basin versus infra 
folia natis. 
It is hard to understand why this plant was referred 
to the genus Aérides by Reichenbach; the only vague 
resemblance is in the saccate spur which is projecting 
obliquely forward under the blade of the lip. The whole 
resemblance stops here. In the adnation of the column 
and in the pollinia it is reminiscent of the characters of 
Rhynchostylis, especially the group Schlechter called 
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