elliptic, obtuse, 8-nerved, about 4.5 mm. long and 2 mm. 
broad. Lateral sepals oblong-lanceolate, acute, slightly 
oblique, dorsally somewhat carinate along the mid-rib, 
about 5 mm. long and 2.5 mm. broad. Petals narrowly 
oblong, obtuse, about 5 mm. long and 1.5 mm. broad. 
Lip 3-lobed, about 5 mm. long and 6 mm. broad, strong- 
ly saceate at the base; lateral lobes oblong, arcuate ; mid- 
lobe triangular, obtuse, exceeding the lateral lobes in 
length; lip with a short retuse callus near the mouth of 
the sac; mid-lobe and margins of the lateral and mid- 
lobe subglandular-pubescent. Column characteristic of 
the genus. 
Thrivspermum Amesianum is a segregate from 7. 
Wenzel as Ames delimited that species. The easiest and 
surest method of distinguishing 7. Amesianum from 7’ 
Wenzel (even when there are no flowers) is by means 
of the subulate-aristate bracts of the inflorescence as con- 
trasted with the shorter non-aristate bracts of 7. Wen- 
zelit. 
When better and more complete material is at hand, 
it is not improbable that 7A mesianwm may prove to be 
an aggregate species. 
Leyte: epiphyte in forest, Jaro, at 300 meters altitude, Novem- 
ber 25, 1914, Wenzel 746 (Tver in Herb. Ames No. 43830). 
Minpanao: cultivated in the Bureau of Science orchid house, 
Manila, said to be from Surigao, Quisumbing 84513. 
The following collections, which for one reason or 
another cannot be determined with certainty, seem to 
belong to this species. 
Luzon: on floating trees in the river, San Mateo River, Province 
of Tayabas, at 30 meters altitude, May 9, 1917, Ramos & Edaiio 28539. 
Leyte: tops of trees, Dagami, Panda, at 60 meters altitude, 
October 10, 1912, Wenzel 41 and same data June 9, 19138, Wenzel 
156; epiphyte in forest, Jaro, Conpagal, at 800 meters altitude, No- 
vember 24, 1914, Wenzel 714. 
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