OF INDIA AND CKYLON. 
m 
Thallus narrow, ribbon-like, flattened, 
to 30 cm. in free parts; pedicel about 
6 mm. ... ...D. dichotoma, Tul. 
Thallus various, usually broad, rarely over 20 cm. long. 
Secondary shoots (floral buds) sessile on thallus by broad 
base, and often square, or broader than high ; bracts usually 
markedly helmet-shaped. 
Pedicel of fruit under 5 mm. long. ...D. minor, Wedd. 
Pedicel of fruit over 5 mm. long. 
Thallus usually small, to 10 cm. 
long and 1 broad, algiform, 
branched, but becoming appar- 
ently much branched and narrow 
in dry specimens by breaking 
away of intermediate tissues. 
Pedicel 8-25 mm. N.E. India and 
Burma ... ...D- Wallichii, Tul. 
Thallus usually large, algiform, 
often to 30 cm., usually much 
branched. Pedicel 6-40 mm. 
S.W. India and Ceylon ...D. stylosa, Wight. 
DIGEÆA ELONGATA, Tul. in Ann. Sc. Nat., 3 ser., t. 
XI., 1849, p. 102, and in Pod. Monogr., p. 124 ; Wight, 
Thwaites, Wedd., Warming, W. cc.; Podostemon elongatum, 
Gardner, in Calc. J. N. H., VII., 1846, p. 188; Hooker, Trimen, 
11. cc. 
Thallus long, narrow, cylindrical, tapering to filamentous, 
attached at base by creeping hapterous part, and with 
cæspitose freely floating parts to 50 cm. long. Secondary 
shoots distichous, the lower to ultimately floriferous, 
the rest deciduous with tips of thallus. Floral buds usually 
slightly stalked, narrow. Fruiting pedicel about 8 mm. 
Thallus cylindrical, dimorphic, rarely over 3 mm. thick in any part; 
lower part frequently branched, creeping, attached by haptera and 
root hairs, and giving off cæspitose freely floating branches to 50-60 
cm. long, sparingly branched and tapering to capillary ends. Secondary 
