cular thickening on the margins of the lip makes it easily 
recognizable. 
The bi-flowered inflorescence might cause it to be 
confused with species of the Subg. Grastidium. All of 
the other characters however, would indicate that it be- 
longs to the Subg. Pedilonum. 
Dendrobium (Subg. Pedilonum) diffusum Z. O. 
Williams, n. sp. 
Herba epiphytica cum caulibus pluribus: basilaribus. 
Caules ramosi, multiarticulati: folia lanceolata, acuta; 
inflorescentia 1—2-flora; sepalum dorsale lanceolatum, 
acutum; sepala lateralia similia; petala oblanceolata, 
acuta: labellum trilobatum, anguste rhombicum, lobis 
lateralibus parvis, lobo medio lanceolato. 
A much branched epiphytic herb with a number of 
stems from a common base. Stems multiarticulate and 
branched, indurated but not greatly thickened, the seg- 
ments 1-2.5 em. long, the older ones often with the 
shredded remains of the old leat-bases, yellow in color, 
the younger parts of the stem covered with the leaf- 
sheaths, not greatly thickened; leaves lanceolate, acute, 
thin, several-nerved, 2.5-6 em. long, 8-7 mm. broad, 
articulated to the striated sheaths which invest the stem; 
inflorescence of but one or two flowers; bracts hyaline, 
lanceolate, about 2 mm. long; flowers medium-sized, 
about 15 mm. long including the mentum; dorsal sepal 
lanceolate, acute, 5-nerved, about 12 mm. long and 5 
mm. broad; lateral sepals attached to the column-foot 
and with it forming a curved mentum which is 6—7 mm. 
long, free part of the blade lanceolate, acute, about 12 
mm. long and 4-5 mm. broad; petals oblanceolate, acute, 
about 12mm. long and 8-4 mm. broad; lip 3-lobed, nar- 
rowly rhombic in outline, about 18 mm. long and 8 mm. 
broad,—the lateral lobes small, near the middle of the 
[44] 
