Sepalum dorsale lanceolatum, acuminatum. Sepala later- 
alia lanceolata, acuminata, basi connata. Petala elliptico- 
lanceolata, acuta, leviter arcuata. Labellum anguste 
oblongo-ellipticum, basi appendice penicillata ornatum. 
Columna generis. 
Slender terrestrial herbs up to about 20 cm. tall. Stems 
flexuose, foliose. Basal leaves unknown. Cauline leaves 
long-petiolate; lamina 5.5-7.5 em. long, 1.4-1.8 cm. 
broad, elliptic or elliptic-lanceolate, acute, membrana- 
ceous, tapering to the petiole at the base; petiole 2-5 
em. long and 0.2—-0.3 cm. broad, canaliculate, semiam- 
plexicaul at the base. Flower terminal, solitary. Dorsal 
sepal about 3 cm. long and 1 cm. broad, lanceolate, acu- 
minate, about 9-nerved, puberulent dorsally. Lateral 
sepals about 3 cm. long and 0.4-0.5 em. broad, lanceo- 
late, acuminate, puberulent dorsally, connate at the base 
for about one third of their length or less. Petals about 
8 cm. long and 0.5 cm. broad, elliptic or elliptic-lanceo- 
late, acute, somewhat arcuate, 7- to 9-nerved, puberulent 
dorsally. Lip about 13 mm. long and 4 mm. broad, nar- 
rowly oblong-elliptic, with a conduplicate ridge down 
the center, papilliferous, originating from the apex of 
the column-foot, with a recurved flattened appendage at 
the base which is about 4 mm. long and penicillate at 
the apex. Column of the genus, about 13 mm. long: 
column-foot about 4 mm. long. 
British New Guinea: alpine, bush margin, Rawlinson Range, Mo- 
robe District, alt. 10,000-12,000 ft., flowers flesh pink, September 
22, 1941, Clemens s.n. (Tyrer in Herb. Ames No. 61211). 
Pterostylis caulescens is easily distinguished from the 
other two known species of the genus in New Guinea by 
its large cauline leaves. The material from which this 
species is described is not very good. 
Pterostylis papuana JLolfe in Kew Bull. (1899) 
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