NEW OR NOTEWORTHY ORCHIDS 
3 (1881) 41, t. 217, fig. I, 1-9. P. formosa Schltr. in Fedde 
Repert. 10 (1912) 291. 
A photograph of the type specimen, together with ana¬ 
lytical drawings of the flower made by Lindley, shows that 
Pleurothallis pachyglossa is inseparable from P. conanthera. 
The type descriptions of both species bear out this con¬ 
clusion. 
The Guatemalan P. formosa, represented in our her¬ 
barium by the type, is specifically inseparable from P. 
pachyglossa. It differs in having, as a rule, somewhat larger 
leaves, often shorter inflorescences and somewhat larger 
flowers. 
The flowers of several Costa Rican collections referred 
to P. pachyglossa show smaller, acute (not acuminate) 
sepals, and lips which are either smooth or rather papillose. 
On the evidence of the specimens which we have referred 
to P. pachyglossa, the species appears to be variable. 
Pleurothallis pruinosa Lindl. in Bot. Reg. 28 (1842) 
Misc. p. 75, No. 55. P. pauciflora Schltr. in Fedde Repert. 
Beihefte 19 (1923) 192. 
A photograph with analytical drawing of typical P. 
pruinosa from Surinam, as well as authentic West Indian 
material of the species, has been compared with the type 
specimen of P. pauciflora from Costa Rica. No constant 
nor marked differences could be found. As a rule, however, 
the Central American specimens have leaves that are a little 
smaller than the leaves of West Indian plants, especially 
with regard to their width. 
Pleurothallis Rowleei Ames Sched. Orch. 1 (1922) 
11- P. cucullata Ames Sched. Orch. 3 (1923) 5. 
Additional material recently received clearly shows that 
P■ cucullata is merely a form of P. Rowleei. When compared, 
the only difference appears to lie in the narrower sepals and 
petals and smaller lip of P. cucullata. However, the species 
seems to be very variable. 
35 
