| 74 Oakes Ames. 
acute, 3 mm long, 1 mm wide. Upper sepal 3 mm long, similar to the 
laterals. Petals lanceolate, 1-nerved, 2 mm long. Lip minute, 3-lobed 
with relatively long lateral lobes, which are erect, oblong, obtuse, and 
diverted forward, at right angles to the column; the saccate middle lobe, 
which is fleshy and provided with a pitcher-like tip at the apex, passes 
at its basal margin, or rim, into thickenings, or calli, one on each side 
at the sinus formed by the lateral and middle lobe; lateral lobes from 
sinus to apex, 1 mm long, 1-nerved. 
Type from Mt. Data, Distr. Lepanto, Luzon, alt. 7000 ft., epiphyte 
in rain forest, October 29, 1905, Elmer D. Merrill (no. 4576). 
While Acoridium tenuifolium is closely allied to A. tenue and A. par- 
vulum, it is very distinct from both, and well characterized by its oblong, 
1-nerved lateral lip-lobes and by its acute, attenuated leaves. 
4. Acoridium tenue O. Ames, l. c., p. 145. 
Pseudobulbi fusiformes; folia lineari-oblonga, obtusa: pedunculi quam 
foliis cum petiolis breviores, vel interdum longiores; sepala lateralia 
lineari-lanceolata, acuminata, acuta, 3-nervia; petala lineari-lanceolata, 
acuminata, acuta; labellum 3-lobatum, 3-callosum, lobis lateralibus luna- 
tis, sub-acutis, lobo medio 3-dentato, dentibus lateralibus magis rotun- 
datis, obtusis vel sub-acutis. 
Whole plant when in flower 12—18 cm high, slender throughout. 
Pseudobulbs 1,5—2,2 cm long, fusiform, when immature concealed by 
the tubular, nervose, acute sheaths. Leaves linear-oblong, obtuse, with 
a minute indentation on the margin on each side above the middle, 
prominently 3-nerved, 3--6 cm long, 2—4,5 mm wide. Petioles slender, 
1 cm long. Peduncles filiform, shorter than the leaf and petiole or some- 
times slightly longer, 4,5—8 cm long. Bracts longer than the ovaries, 
erose-dentate on the margin, 2 mm long. Flowers 2 mm apart, in ` 
slender, graceful, flexuose racemes. Racemes 2,7—6,3 cm long. Lateral 
sepals linear-lanceolate, acuminate, acute, 3-nerved, 3 mm long, 0,9—1 mm 
wide. Upper sepal similar to the laterals. Petals narrowly lanceolate, 
acuminate, acute, 2,5 mm long. Lip 3-lobed; lateral lobes diaphanous, 
semi-crescent-shaped, sub-acute, with a free callus-like appendage at base 
on the inner margin of each; middle lobe 0,5 mm long, tridentate, the 
lateral teeth rounded, obtuse or sub-acute; near the base of the lip on 
the median line is a minute tubercle or callus. Column minute, similar 
to that of A. tenellum Nees € Meyen. 
Type from the trail to Mt. Apo, Mindanao (growing on mossy trees) 
April 19, 1904, E. B. Copeland (no. 1019a); additional material from 
Lamao River, Mt. Mariveles, Prov. Bataan, Luzon, October, 1903, Elmer 
D. Merrill (no. 3217a). 
Acoridium tenue in habit forms a connecting link between the grass- 
leaved A. graminifolium and the broad-leaved A. venustulum. The lip, 
however, is more like the lip of A. tenellum. 
5. Acoridium parvulum O. Ames, l. c., p. 146. 
Herbae minutae; folia lineari-oblonga, obtusa, truncata; pedunculi 
