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BOTANICAL MUSEUM LEAFLETS 
HARVARD UNIVERSITY 
CampripGce, MassacnuseTts, Juty 30, 1938 You. 6, No.5 
REVIEW OF THE GENUS THRIXSPERMUM 
IN THE PHILIPPINE ISLANDS 
BY 
Louis O. WILLIAMS 
‘THRIXSPERMUM Is one of the most difficult genera of 
the Philippine Sareanthinae to study and to determine 
as the flowers are membranaceous, are rarely produced 
» in abundance and tend to become agglutinated upon 
drying and pressing. 
In the large collection of orchids made in the Phil- 
ippines by A. Loher and received by the Ames Herbar- 
ium from the Philippine Bureau of Science for study and 
determination, were many specimens belonging to the 
genus Thrixvspermum. In order to determine them and 
other accumulated specimens of the genus, a revision of 
the Philippine species became necessary. 
The specimens now at hand, while not a complete 
representation of the probable Philippine species, is ad- 
equate for a study of the species recognized at present. 
A study of the genus through the medium of living 
plants may necessitate a change in the conception of some 
of the species as represented in this revision. 
The only paper of importance concerning the Phil- 
ippine species of Thriaspermum is that of Ames (Orch. 
5 (1915) 201-210) in which most of the previously known 
Philippine species are described. 
It is the plan of this paper to give a key to the recog- 
nized Philippine species of Thrivspermum, their biblio- 
graphy, distribution and descriptions of the new species. 
[77 ] 
