large. The specific name is in allusion to the dentate 
margins of the lip. 
Borivar : Churu-tepui (Muru-tepui), northwest cumbres, occasional 
on rock ledges in upper cumbre, at 2250-2300 meters altitude, flowers 
white, January 26, 1953, John J. Wurdack 34218 (Tyrer in Herb. 
Ames No. 69525); Chimanta Massif, east central portion of summit 
of Apdcara-tepui, at 2450-2500 meters altitude, ‘‘on moist ledges of 
high large rock around cave recess, leaves dark purple or dull green 
with purple; pedicels reddish; sepals, petals and lip pale yellow, 
nodding,’’ June 21-22, 1953, Julian A. Steyermark 75867. 
Octomeria filifolia C. Schweinfurth sp. nov. 
Herba gracillima, epiphytica, caespitosa, usque ad 17 
em. alta. Caules tenues, pluriarticulati, circiter 3.5—9 
cm. alti, vaginis longe tubulatis arctissimis celati. Folium 
angustissime lineare vel filiforme, in vivo subteres, usque 
ad 9 cm. longum et in sicco 1.5 mm. latum. Flores in 
glomerulis axillaribus, minimi, membranacei. Sepala tri- 
nervia. Sepalum dorsale oblongo-lanceolatum, acutum 
vel acuminatum, tubulari-involutum, circiter 3 mm. 
longum et 1 mm. latum expansum. Sepala lateralia 
triangulari-lanceolata, acuta, cum pede mentum forman- 
tia, circiter 8 mm. longa et 1.2 mm. lata. Petala lan- 
ceolata-linearia, acuta vel acuminata, tubulari-involuta, 
I-nervia, sepalis paulo breviora, circiter 2.4 mm. longa 
et 0.6 mm. lata. Labellum parvum, tubulari-involutum, 
prope medium trilobatum, basi cuneatum, expansum 
circiter 1.5 mm. longum et fere 1 mm. latum; lobi later- 
ales oblique semiovati, acuti; Jobus intermedius multo 
major, suborbicularis, apice rotundatus et minute apicu- 
latus; discus lobi medii basi obscure bicarinatus. Colum- 
na antice plana, circiter 1.4 mm. alta. 
No close ally of this species was noted. 
Borivar: Chimanta Massif, northwestern part of Abdcapa-tepui, 
vicinity of Camp 8, at 1300 meters altitude, on forested slopes adja- 
cent to quebrada, epiphyte on tree trunk, ‘‘leaves purplish with green ; 
petiole purple; flowers pale green with lavender,’’ April 20, 1953, 
Julian A. Steyermark 75181 (Tyee in Herb. Ames No. 69526). 
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