Basionym: Saccolabium galbinum J.J.Sm. in Bull. Jard. Bot. Bui- 
tenz. ser. 2, 26: 97, 1918. 
Porrorhachis macrosepala (Schltr.) Garay, comb. nov. 
Basionym: Sarcochilus macrosepalus Schltr. in Fedde Rep. 10: 208, 
1911. 
Pteroceras Hassk. in Tijdsch. Nat. Ges. 9: 142, 1842. 
Type: Pteroceras radicans Hassk. 
Characterized by the short column with along column- 
foot to which the lip is movably attached. Pollinia 2, 
each more or less divided in subequal halves on a distinct 
stipe. Lip usually continuous in position with the 
column-foot, saccate or calearate with distinct lateral 
lobes and an abbreviated midlobe which is never repli- 
cate. Spur or sac without callosities, but the anterior 
wall at times may be quite fleshy as is observable in 
longitudinal sections. 
Parasarcochilus Dockr., which is referable here, is a 
clear example of the semantics previously mentioned 
regarding the number of pollinia. Dockrill states that 
Parasarcochilus ‘‘superficially . . .. closely resembles 
Pteroceras, but members of this latter genus have only 
two pollinia, whereas those of the new genus have four’, 
that is ‘‘Pollinia 4 in 2 closely appressed pairs (members 
of the pairs unequal)’’. Yet in the original description 
of Pteroceras we find ‘‘massae pollinis 4°’ which are 
clearly illustrated on the original drawings of Pteroceras 
radicans Which I have studied and which is partly repro- 
duced by Reichenbach in Xenia Orchidacea 2: t. 140, 
1867, under the name of Sarcochilus teres (Bl.) Rehb.f. 
It should be noted that Parasarcochilus Weinthali 
(Bail.) Dockr. is a true Sarcochilus. It has neither a spur 
nor a sac to the lip. Apparently the elongate lateral 
lobes of the lip must have served as the reason for the 
ill-fated transfer. 
Pteroceras has only recently been recognized through 
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