the efforts of Holttum who published a valuable discus- 
sion on its distinction from Sarcochilus R.Br. Untfortu- 
nately Holttum did not recognize the generic characters 
of Grosourdya Rehb.f. and Ascochilus Ridl., when he 
removed the true Sarcochilus species of this heterogene- 
ous complex. With the exclusion of Grosourdya and 
Ascochilus, the genus Pteroceras becomes a well-defined 
genus which ultimately will be broken up into three or 
four distinct sections based on the vegetative aspects and 
inflorescence types. 
It is probable that Pteroceras alatum (Holtt.) Holtt., 
P. Berkeleyt (Rehb.f.) Holttum, P. membraniferum 
(Carr) Garay and P. longicaleareum (Ames & Rolfe) 
Garay in the future may be elevated into a separate 
genus, for they differ from the rest of the members in 
having all of the flowers open simultaneously. This lat- 
ter group in many ways is much closer to the genus 
Macropodanthus L.O.Wms. than to Pteroceras, but the 
structural differences in the column and the lip at this 
point sufficiently keeps them apart. 
Pteroceras chrysanthum (Schltr. ) Garay, comb. nov. 
Basionym: Sarcochilus chrysanthus Schltr. in Fedde Rep. Beih. 1: 
966, 1913. 
Pteroceras fragrans (Ridl.) Garay, comb. nov. 
Basionym: Sarcochilus fragrans Ridl. in Journ. Str. Br. Roy. As. 
Soc. 49: 38, 1907. 
Pteroceras hirticalcar (Dockr.) Garay, comb. nov. 
Basionym: Parasarcochilus hirticalear Dockr., Austral. Sarcanth. 
23, 1967. 
Pteroceras iboensis (Schltr.) Garay, comb. nov. 
Basionym: Sarcochilus iboensis Schltr. in Fedde Rep. Beih. 1: 966, 
1913. 
Pteroceras longicalcareum (Ames & Rolfe) Garay, comb. nov. 
Basionym: Sarcochilus longicalcareus Ames & Rolfe in Ames, Orchid. 
5: 212, 1915. 
Pteroceras membraniferum (Carr) Garay, comb. nov. 
Basionym: Sarcochilus membraniferus Carr in Gard. Bull. Str. Settl. 
8: 121, 1935. 
[ 1938 ] 
