s 



MOUNT ROEAIMA J.N BBITISH GUIANA. 59 



3-flowered. Bracts spathaceous, minute. Pedicels 1/, lin. long. Dorsal sepal ovate at 

 the base, caudate-acuminate above, 2 lin. long; lateral similar, but narrower at the base. 

 Petals oblong, obtuse, 1 lin. long, thinly membranaceous. Lip trilobed, 1 lin. long; 

 side lobes spreading, broadly rounded; front lobe oblong, obtuse; disc bearing a pair of 

 thickened nerves. Column clavate, f lin. long. 



Roraima, summit, 8(500 ft., McConnell 8f Quelch, 087. — Endemic. 



Allied to the Colombian Pleurothallis intricata, Lindl., but smaller in all its parts, 

 besides being different in structure. The species of the natural group Lepanthiformes, 

 to which it belongs, were distributed by Lindley into three sections, owing to the 

 exigencies of an admittedly artificial arrangement, which would place the present one 

 in the section Acwndnatce. 



Stems gtjianensis, RollV. sp. n. Csespitosa. Caules brevissimi. Folia oblanceolato- 

 oblonga, subobtusa, basi subattenuata. Scapi graciles, multiflori. Bracteaj 

 triangulari-ovata-, acutse. Pedicelli breves. Sepala orbieulari-ovata, obtusa, basi 

 connata. Petala suborbieularia, concava. Labellum integrum, suborbiculure, 

 petalis paullo angustius. 

 A dwarf, densely-tufted plant, with very short stems. Leaves oblanceolate-oblong, 

 subobtuse, somewhat attenuate at the base, 4-9 lin. long, li-2 lin. broad. Scapes 

 slender, 2^ in. long, many-flowered. Bracts triangular-ovate, acute, \ lin. long. Pediceb 

 f lin. long. Sepals orbicular-ovate, obtuse, f lin. long, slightly pubescent, the basal 

 fourth connate. Petals broadlv orbicular, somewhat concave, not half as long as the 

 sepals. Lip entire, rather narrower than the petals, but otherwise very similar. 

 Roraima range, 3500 ft., McConnell ty Quelch, 703. — Endemic. 



A species belonging to Lindley's small group MonastachycB apodce, and allied to the 

 Peruvian S. ptmlla, H. B. & K. A specimen collected at the Kaieteur Savannah, 

 Potaro River, British Guiana, by Jenman (1055), is either a form of the same or a 

 closely allied species. 



Brachionidium brevicatjdatum, Rolfe, sp. n. Caulis primarius repens, brevis; 



secundarius brevissimus. Polia breviter petiolata, elliptico-lanceolata, tridenticu- 



lata. Pedunculi lili formes, uniflori. Bractese apice acuminata?. Sepalum posticum 



ovatum, apice abrupte acuminatum vel brevissime caudatum; sepala lateralia 



omnino connata et postico subsimilia. Petala ovata. acuminata vel brevissime 



caudata, margine plus minusve ciliata. Labellum sessile, trilobum, lobis lateralibus 



falcato-oblongis subobtusis, intermedio reflexo late ovato-rotundato. Columna lata. 



Primary stem creeping, with short internodes, clothed with membranaceous sheaths ; 



secondary very short, clothed with about two tubular membranaceous sheaths having a 



short acuminate apex. Leaves shortly petioled, elliptical-lanceolate, shortly tricuspidate, 



8-10 lin. long. 2^-3| lin. broad ; petioles 1^-2 lin. long. Peduncles slender, f-lj in. 



long, bearing a short tubular acuminate sheath above the middle. Bract similar to the 



sheath but rather larger. Dorsal sepal ovate, abruptly acuminate or shortly caudate, 



4 lin. long by nearly 3 lin. broad, trincrved ; lateral pair united into a body closely 



resembling the dorsal sepal, but rather broader and 1-nerved. Petals ovate, shortly 



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