Sepalum dorsale elliptico-ovatum, acutum. Sepala lat- 
eralia late ovato-lanceolata. Petala ovato-lanceolata vel 
ovata, acuta. Labellum integrum, late subecordatum, 
tricallosum. 
An epiphytic herb with fibrous roots. Stem short, 
about 2 cm. long, covered with persistent leaf-sheaths. 
Leaves distichous, crowded, coriaceous, rugose when 
dry, oblong-lanceolate, obtuse or acute, 2.5—9 em. long, 
0.5-1.7 em. broad. Peduncle exceeding or subequaling 
the leaves, slender, usually with a sterile bract near the 
middle. Inflorescence densely flowered, 7-25 mm. long. 
Bracts of the inflorescence lanceolate, acerose, imbri- 
cated, about 8 mm. long. Dorsal sepal elliptic-ovate, a- 
cute, 5-nerved, about 7 mm. long and 8.5 mm. broad. 
Lateral sepals broadly ovate-lanceolate, 5-nerved, about 
8mm. long and 4mm. broad. Petals ovate-lanceolate to 
ovate, 5-6 mm. long and 1.2—1.5 mm. broad, acute, 8-to 
5-nerved. Lip entire, broadly subcordate, obtuse, rather 
strongly saccate, about 6 mm. long and nearly as broad, 
with three calli; the lateral pair of calli small, mammil- 
late, on the margin of the sac; the median callus some- 
what larger, glandular-pubescent, situated in the sac. Col- 
umn characteristic of the genus. 
Thrivspermum integrum may be distinguished from 
its allies, 7. eximiwm LL. Wis. and 7. Vanoverberghii 
Ames, by means of the entire lip and other details of the 
perianth. The bracts of the inflorescence are much longer 
than those of either of its allies. 
Luzon: on trees, Bauco, Bontoc Subprovince, at 1450 meters al- 
titude, September-October 1912, Vanoverbergh 1531 (Type in Herb. 
Ames No. 15112) ; on trees, Bontoc Subprovince, at 1400 meters al- 
titude, July 30, 1910, Vanoverbergh 632. 
Leyte: on trees of medium height, Dagami, Panda, at 60 meters 
altitude, October 24, 1912, Wenzel 53. 
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