The CILALOLLL ree 
HARVARD UNIVERSITY 
Camaripce, Massacuuserns, Fen BRUARY RY 8, 1946 Voi. us No. 5 
ORCHIDACEAE NOVAE GUINEAE I’ 
BY 
Louis O. WiLLIAMs 
THE orcHIDs described and discussed here were col- 
lected in New Guinea either by Mr. L. J. Brass on the 
third Archbold Expedition in 1936-19377 or by Mrs. 
Mary Strong Clemens in 1940-1941. 
The material collected by Mr. Brass is well prepared ; 
in most cases there are duplicates which will be distrib- 
uted by the Arnold Arboretum. The types of all new 
species described are in the Oakes Ames Orchid Herbar- 
ium, Harvard University, Cambridge, Massachusetts. 
Paphiopedilum papuanum (fidl.) L.O. Williams 
comb, nov. 
Cypripedium papuanum Ridley in Gard. Chron. ser. 3, 
58 (1915) 131, fig. 43. 
Paphiopedilum papuanum is closely allied to P. violas- 
cens Schltr., which also comes from New Guinea. 
Pterostylis caulescens L. O. Williams sp. nov. 
Herbae graciles, terrestres, usque ad ca. 20 cm. altae. 
Caules flexuosi, foliosi. Folia basalia ignota. Folia cau- 
lium longe petiolata; lamina elliptica vel elliptico-lan- 
ceolata, acuta, membranacea. Inflorescentia uniflora. 
1 Botanical Results of the Archbold Expeditions. 
*For an account of this expedition see A. L. Rand and L. J. Brass 
in Bull. Am. Mus. Nat. Hist. 77 (1940) 341-380, tt. 21-42. 
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