146 Ames New Species of Acoridium from the Philippines. 



tate 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-lance 

 olate, 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. Mer 

 rill (No. 3217"). 



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. 



Acoridium parvulum sp. nov. 



Herbaeminutae ; folia lineari-oblonga, obtusa, truncata ; pedunculi quam 

 foliis longiores ; sepala lateralia lanceolata, acuta, 1-nervia ; petala lanceo- 

 lata, acuta, 1-nervia ; labellum 3-lobatum, 2-callosum, lobis lateralibus 

 oblongo-falcatis, obtusis, lobo medio retuso-mucronato. 



Affinities with A.tenue. Whole plant not exceeding 8 cm. in height. 

 Pseudobulbs monophyllous, 4-10 mm. long, clothed with tubular acute 

 sheaths. Leaves linear-oblong, obtuse, truncate, prominently 3-nerved, 2- 

 3.5 cm. long, 2-2.5 mm. wide. Peduncles very slender, slightly longer than 

 the leaves, 3-4 cm. long. Raceme graceful, 1.5-2 cm. long, about 3 mm. 

 through. Bracts acute, longer than the ovary, 1.5 mm. long. Flowers 

 when spread out 4 mm. across. Lateral sepals lanceolate, acute, 1-nerved, 

 2.5 mm. long, about 1 mm. wide. Upper sepal similar to the laterals, about 

 3 mm. long. Petals lanceolate, acute, 2 mm. long, 1-nerved. Labellum 

 1.25 mm. wide, 3-lobed ; lateral lobes oblong-falcate, rounded at the apex, 

 erect, clasping the column ; middle lobe broader than long, the apex re- 

 tuse, mucronate. From the inner basal margin of each lateral lobe a thick 

 ening, callus-like in its nature, extends to the middle of the middle-lobe, 

 where the two thickenings become confluent. Column minute, with a 

 protuberance in front. 



From Lamao River, Mt. Mariveles, Prov. Bataan, Luzon, October, 

 1903, Elmer D. Merrill (No. 32L76). 



Acoridium parvulum, which is the smallest member of the genus known 

 to come from the Philippine Islands, resembles closely A. tenue, though 

 this is a larger species, with longer leaves, more slender, longer pseudo- 

 bulbs, longer racemes and narrower, 3-nerved sepals. The leaves of A. 

 parvulum do not taper at the base so abruptly as those of A. tenue. No. 

 3217 of Merrill's collections consists of a mixture of A. parvulum and A. 

 tenue. 



