mm. broad. Lateral sepals semiovate, oblique, acute, 
5-nerved, about 4-5 mm. long and 8 mm. broad. Petals 
similar to the lateral sepals but smaller, about 8.5 mm. 
long and 2 mm. broad. Lip 8-lobed, slightly saccate, 
about 2 mm. long; lateral lobes semiorbicular, about 2 
mm. broad; mid-lobe semiorbicular, small; lip with a 
‘allus in each sinus and one in the sac. Column charac- 
teristic of the genus. 
Among the Philippine species of the genus, Thria- 
spermum Elmert is most closely allied to 7. Robinsonti 
Ames. It may be distinguished from 7" Robinsoni by 
having much smaller flowers, by a lip which has the mid- 
lobe very small in comparison with the lateral lobes, by 
the sac being much larger in comparison to the size of 
the flower, and by the pubescent median callus being 
very small and inconspicuous. 
The type specimen of 7° Hlmeri consists of one plant, 
of a single flower which is now in the glycerine collection 
of the Ames Herbarium and of the analytical drawings 
which I have made. 
Necros: Dumaguete (Cuernos Mountains), Province of Negros 
Oriental, April 1908, Elmer 9848 (Type in Herb. Ames No.43878). 
4. Thrixspermum quinquelobum 4mes Orch. 
5 (1915) 206. 
A most distinctive and rare species which is to be dis- 
tinguished from the other Philippine species of Thrix- 
spermum by means of the 5-lobed lip. 
Luzon. 
5. Thrixspermum fantasticum L. O. Williams 
sp. nNOv. 
Herba epiphytica, parva. Radices fibratae, elongatae. 
Caules leviter complanati, foliosi. Vaginae foliorum per- 
sistentes, caulem obtegentes. Folia oblongo-oblanceola- 
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