lished a note indicating my belief that there seemed to 
be sufficient morphological evidence to maintain it [Dr- 
aerium indivisum| as specifically distinct from the only 
other Trinidad representative of the genus. Subsequent- 
ly, when Dr. Wilbur G. Downs sent me from Trinidad 
photographs and additional material of the two concepts 
of Caularthron known to grow on the island, I began to 
realize that a revision of the genus Diacrium was neces- 
sary before a clear understanding of the Trinidad material 
could be expected. 
The type specimen of EHpidendrum imdivisum is pre- 
served at Kew, together with Bradford’s handwritten 
description of the concept. The type bears the annota- 
tion ‘‘Herb. Hance 5334.’” On the same sheet with the 
type there are pasted two inflorescences from plants col- 
lected in Trinidad and flowered at Kew in May 1889. 
Rolfe has annotated this collection as ‘‘E/pidendrum bi- 
cornutum var. cleistogamic flowers=D. indivisuwm.”” 
According to Bradford’s manuscript description, the 
type has an undivided lip. In the published description, 
the lip of the type was stated to be ‘undivided or mi- 
nutely auricled above the base.”’ The apical part of the 
lip was described as ‘tacuminatum’”’ in the manuscript 
and ‘‘subulate-lanceolate’’ in Grisebach’s Fora. Untor- 
tunately, the type has, at the present time, only two 
buds and one imperfect flower. We know from later ma- 
terial, however, that, in Trinidad, this concept is often 
cleistogamous. It is possible that the type flowers may 
have been peloric. At least, we do know from the ma- 
terial now available from Trinidad that the lip is very 
rarely entire but is most often laterally auriculate at the 
base or inconspicuously bilobulate. In this, as in other 
respects, the concept does not depart from Caularthron 
bilamellatum, of which it is, consequently, here desig- 
nated as a synonym. 
[ 97 | 
