41 6 PodosteinonacecB. \Podostemon.. 



appearance. They grow intermixed on rocks in rapid streams, and for 

 the greater part of the year are entirely submerged. In the dry season, 

 when the level of the water falls, they become uncovered and the flowering 

 and fruiting occurs. 



Perianth 3-leaved; stam. 3 . . .1. L.wvia. 

 Perianth o; stam. 2, rarely i . . .2. PODOSTEMON. 



I. ZiAWZA,^- Grijff. 



Thallus confluent into a flat frond with dilated flabelliform 

 lobes ; 1. in fascicles, linear, fl. solitar}', bisexual, pedicellate, 

 ped. surrounded at base with a short bristly spathe ; pcrianth- 

 segm. 3, slightly imbricate ; stam. 3 ; ov. 3-celled (but septa 

 sometimes absent), ovules numerous, placentas thick, styles 3, 

 feathery ; capsule septicidally 3-valved. — Sp. 7 ; all in Fl. B. 

 Ind. 



Zi. zeylanica, Tiil. in Ann. Sc. Nat. se?-. 3, xi. 112 (1849). 



Tristicha zeylanica., Gardn. in Calc. Joiirn. Nat. Hist. vii. 177. 

 Terniohi zeylanica, Tul. Mon. Podost. 190; Trim. Syst. Cat. Ceyl. ']'}). 

 Dalzellia\ zeylaniai, Wight, Ic. v., pt. 2, 35 ; Thw. Enum. 223. C. P. 3809. 



Fl. B. Ind. V. 62 (Term'ola). Wight, Ic. t. 1919, f. I {Tulasnea 

 zeylanica). Warming in Vidensk. Selsk. Skr. Kiobenh. vii. 4, ff. I'j-yt. 



Frond very thin, closely adherent to the subjacent rock, 

 wide-spreading, much-branched, pale green becoming olive- 

 brown, shining; 1. very small, in minute star-like tufts, linear- 

 strap-shaped, obtuse ; spathe fleshy, densely covered with 

 short softly spinous processes, ped. twice as long as fl., 

 perianth-segm. nearly distinct, oblong-lanceolate, acute; stam. 

 as long as scgm., capsule ovoid-oblong, 9-ribbed. 



On rocks in swift-running water, rare. Abundant on water-worn 

 blocks in the Mahaweli River a little below Peradeniya Gardens at 

 about 1600 ft.; Haragama, lower down on the same river; stream below 

 Lagalla, Matale East. Fl. Jan., Feb.; pinkish- white. 



Endemic. 



Extremely like a moss when in fruit, but the frond or mature 'thallus' 

 resembles that of a lichen. 



2. PODOSTEMON, Mich. 



Thallus or frond various, floating or attached to subjacent 

 rock, cylindrical, dilated, or ribbon-like, 1. small, in fascicles or 

 imbricate, deciduous (or none .■') ; fl. solitary, each surrounded 



* Commemorates J. S. Law of the Bombay Civil Service. Wight's 

 previous genus of the same name is reduced to Adenos(ich>ue. 



t Dedicated to N. A. Dalzell, M.A., of the Bombay Medical Esta- 

 blishment. 



