cies of Diaphananthe, including most of the type speci- 
mens, has enabled me to reduce some species to synony- 
my while on the other hand I have added to the number 
by transferences from other genera and by describing 
several new species. The details of these changes are 
given below under the headings of the various species 
recognised. I am still doubtful as to the exact relation- 
ships of a few of the species and also have insufficient 
material of what may prove to be additional new species. 
The total number of species on my present reckoning is 
24, which is one more than the total in Schlechter’s ac- 
count of the genus (Beih. Bot. Centralbl. 86, Abt. 2 
(1918) 95-101). 
Schlechter divided the genus into three sections as 
follows :— 
1. Eu-Diaphananthe. Stems very short ; pedicels aris- 
ing singly. 
2. Gibbostium. Stems much elongated ; pedicels aris- 
ing singly. 
3. Enantianthe. Stem rather short; leaves fleshy; 
pedicels opposite or whorled. 
This arrangement is to a certain extent convenient in 
classifying the species, but it takes no account of the two 
quite different types of column structure found in the 
genus. One group of species containing the lectotype 
species (D. pellucida (Lindl.) Schltr. of Beih. Bot. Cen- 
tralbl. 836, Abt. 2 (1918) 97) possesses a narrow acute 
decurved rostellum and a common viscidium to which 
the pollinia are attached by separate stipites. The other 
group possesses a column similar to that in the genus 
Rhipidoglossum, the rostellum being distinctly trilobed 
with a fleshy porrect middle-lobe while each pollinium 
is furnished with a separate stipe and viscidium. 
The species are enumerated below in accordance with 
what I think are the affinities of the species, but I have 
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