coriaceous, 8-7 cm. long and 0.8-2 cm. broad. Peduncle 
slender, glabrous, with one or two sterile bracts. Inflo- 
rescence densely flowered, 0.8-2 cm. long. Bracts of the 
inflorescence imbricated, obtuse, very short, about 0.5 
mm. long. Dorsal sepal ovate, obtuse, about 6 mm. long 
and 3 mm. broad. Lateral sepals subrotund, obtuse, 5- 
nerved, 6-7 mm. long and 6 mm. broad. Petals oblong- 
ovate, about 6 mm. long and 4 mm. broad, obtuse, 5- 
nerved. Lip 3-lobed or apparently 4-lobed because of the 
retuse mid-lobe, with three prominent calli; the median 
callus extends nearly the length of the lip, with the api- 
cal portion free; two arcuate lateral calli are free for 
nearly their full length; the sac at the base of the lip is 
directed backward (not downward). Column characteris- 
tic of the genus. 
Thrivspermum eximium is allied to 1’. Vanoverberghu 
Ames from which it may be distinguished by the short 
obtuse instead of subulate, bracts; by the broader sepals 
and petals; by the lip being saccate at the base instead 
of toward the apex; and by the lip having a longitudinal 
callus and two lateral calli instead of two lateral calli and 
a median comose appendage. The lobing of the lip in the 
two species also differs. 
Luzon: Bontoc Subprovince, January 1911, Vanoverbergh 1091 
(Type in Herb. Ames No. 13654); on branches of trees, Mt. Caua, 
Bontoc Subprovince, at 4900 feet altitude, March 3, 1920, Ramos & 
Edaito 87979 (Coryerin Herb. Bur. Sci., Manila) ; epiphyte in forest, 
Jaro, Masaganap, at 600 meters altitude, March 9, 1914, Wenzel 309 
(Herb. Ames No. 43985). 
8. Thrixspermum integrum L. O. Williams sp. 
nov. 
Herba parva, epiphytica. Caules breves, foliorum 
vaginis obtecti. Folia oblongo-lanceolata, obtusa vel 
acuta, disticha, valde conferta. Inflorescentia densiflora. 
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