pert. Beihefte 1 (1912) 440 et seq. Specifically it is most 
closely allied to Dendrobium aberrans Schitr., from 
which it is easily distinguished by the larger leaves, 
longer stems which are not much swollen, by the entire, 
obtuse or truncate petals, by the lamina of the lip which 
has quite different calli, as well as by the general shape 
of the mentum and by other details of the flower. 
Dendrobium palustre L. O. Williams sp. nov. 
Herbae epiphyticae, parvae, erectae vel adscendentes. 
Folia petiolata; lamina elliptica, acuta vel obtusa, cori- 
acea; petiolus canaliculatus. Inflorescentia racemosa, 
brevis, tri- usque ad quinqueflora. Sepalum dorsale 
ovato-lanceolatum, acuminatum. Sepala lateralia men- 
tum formantia; lamina ovato-lanceolata, acuminata. Pe- 
tala subrhombico-oblanceolata, acuta vel acuminata. 
Labellum oblongo-oblanceolatum, apice trilobulatum, 
acuminatum, basi sepalis lateralibus adnatum. Columna 
sectionis. 
Small caespitose, epiphytic, erect or ascending herbs 
up to about 20 cm. long. Pseudobulbs up to 8 em. long 
and 0.5 ecm. in diameter, unifoliate. Leaves 11-13 cm. 
long and 1.3—2.38 cm. broad, petiolate; lamina 7-10 cm. 
long, elliptic, acute or obtuse, coriaceous; petiole up to 
5 em. long, canaliculate. Inflorescence a short 8- to 5- 
flowered raceme borne in the axil of the leaf or at a node. 
Flowers large for the section, green with purple lines, 
the lip white. Dorsal sepal 9-11 mm. long and about 4 
mm. broad, ovate-lanceolate, acuminate, 5-nerved. Lat- 
eral sepals elongated at the base and forming a mentum 
with the column-foot; lamina 9-11 mm. long and 4-5 
mm. broad, ovate-lanceolate, acuminate, 5-nerved ; bases 
15-18 mm. long, adnate to the column-foot and form- 
ing a mentum which is spur-like for 8-10 mm. at the tip. 
Petals 7-9 mm. long and 8-8.5 mm. broad, obliquely 
{ 160 | 
