Pleurothallis xanthochlora Reichenbach filius in 
Linnaea 22 (1849) 823—Lindley Fol. Orch. Pleurothal- 
lis (1859) 7, no. 26. 
Humboldtia wanthochlora O. Kuntze Rev. Gen. Pl. 2 
(1891) 668. 
Pleurothallis huanucoensis Schlechter in Fedde Repert. 
Beih. 9 (1921) 75; ex Mansfeld in Fedde Repert. Beih. 
57 (1929) t. 114, nr. 448. 
It seems to me that Pleurothallis huanucoensis cannot 
be separated from P. wanthochlora. The only significant 
difference between these concepts is that P. huanucoensis 
has erect racemes of white flowers, whereas P. wantho- 
chlora has divaricate racemes of greenish yellow flowers. 
The lip of P. wanthochlora appears to vary from having 
a distinct lateral tooth on each side to being subentire or 
even entire in outline. Peruvian collections referable to 
this species have flowers ranging from greenish white to 
pale yellow. 
Although the type of P. wanthochlora was described 
from Venezuela, several Peruvian collections have since 
been made. 
Diothonea gratissima Peichenbach filius in Bot. 
Zeit. 10 (1852) 772, ampl. C. Schweinfurth. 
Unfortunately, this species was so inadequately de- 
scribed that it is impossible to gain a definite conception 
of it from the original source alone and no subsequent 
amplification has appeared. In the Ames Herbarium, 
however, there are records from the Reichenbach Her- 
barium in Vienna which undoubtedly represent the type 
of D. gratissima; and these, except for slight discrepan- 
cies in some of the lips give a fairly definite idea of a 
concept which has been widely referred to in literature. 
For purposes of clarification, therefore, | herewith give 
the following amplified description. 
[ 178 | 
