subrhombic-oblanceolate, acute to acuminate, 3-nerved, 
very obscurely denticulate toward the apex. Lip (free 
portion) 13-15 mm. long and about 5 mm. broad near 
the apex, oblong-oblanceolate, trilobulate at the apex, 
acuminate, adnate to the lateral sepals at the base, ecal- 
lose. Column of the section. 
British New Guinea: in tufted clumps, boggy margin of Conifer 
Pond in mosses near the ground, Amieng on Yaneng River, a tribu- 
tary of the Buso River, above mouth of Tosapik Creek, Morobe Dis- 
triet, flowers green with purple lines, lip white, alt. 5000-6000 ft., 
March 25, 1941, Clemens 12056c¢ (Tyrer in Herb. Univ. Michigan; 
fragment in Herb. Ames). 
Dendrobium palustre belongs to the subgenus Euden- 
drobium, section Oxyglossum and is most closely allied 
to D. petiolatum Schltr. and to D. undatialatum Schltr. 
It is easily distinguished from both of these species in 
being a larger plant with larger flowers and in having 
several differences in floral detail. 
Calanthe fissa L. O. Williams sp. nov. 
Herbae graciles, erectae, usque ad ca. 6 dm. altae. In- 
florescentia multiflora, conferta. Sepala late oblanceolata 
vel elliptica, acuta, cucullata. Petala oblanceolata, ob- 
tusa, basi columnae adnata. Labellum trilobatum, cal- 
caratum; lobi laterales explanati, lineares, obtusi; lobus 
medius linearis, emarginatus. Columna generis. 
Slender, erect, terrestrial herbs up to about 6 dm. tall. 
Stems short, indurated. Leaves narrowed to a petiole at 
the base; lamina 25-40 cm. long and 2.5—4 em. broad, 
linear-elliptic, acute or acuminate, with seven to nine 
main nerves; petiole 20-85 cm. long, indurated. Inflo- 
rescence up to about 8 dm. long, scapose, slender, many- 
flowered above, glabrous; bracts 1-2 cm. long, linear 
to linear-lanceolate, acute; raceme compact, 10-20 cm. 
long, up to fifty-flowered. Sepals about 10-12 mm. long 
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