OF INDIA AND CEYLON. 
207 
Thallus ribbon-like, endo- 
genously branched ; secondary 
shoots as in Hydrobryum, 
but behind the branches of 
thallus. Seeds 2-4, fruit 
dehiscent or not, ribbed or 
not ... ... Farmeria. 
tristicheæ:. 
TRISTICHA, Du Pet. Th. Nov. Gen. Madag.,p. 2, No. 8, 
1806; Endl., Gen. Plant., p. 270, No. 1835; Presl.. Rel. 
Haenk., p. 86 ; Meisner, Vas. Gen., p. 122 ; Gardn., Calc. J. 
N. H., VII. , p. 177 p.p. ; Tul. in Ann. Sc. Nat., ser. 3, t. XI., 
1849, p. Ill, and Monographia Podostemacearum, 1852? 
p. 179 ; Dufour ; Dufourea^ Bory in Willd. Sp. PL, pt. 5, 
p. 55, Willdenow, A. St. Hil., A. Rich., Spreng., Roem. 
et Sch,, non H. B. K., nec Delise ; Philocrena^ Bong. ; 
Dalzellia, Wight, p.p.. Warming ; Terniola (Tul.), Wedd., 
p.p. ; Lawia (Tub), Wmg., 0. Kuntze, p.p. ; Tulasnea, 
Wight, p.p. 
Perianth (3). Stamens 1 or 3, alternating with peri.inth 
segments. Carpels (3), stigmas 3. Roots creeping ; shoots 
not thalloid, much branched, many-flowered. 
Perianth 3-partite hypogynous, imbricate, sepaloid, membranous, 
marcescent. Stamens 1 or 3, alternate with perianth segments ; 
filaments slender ; anther ovate, pollen globose. Ovary superior, free, 
ellipsoidal, 3-gonous, 3-locular, with thick placentæ and go anatropous 
ovules ; septa thin and fragile. Stigmas 3, linear or subulate, often 
with long papillæ or hairs, marcescent. Capsule triangular, 9-ribbed, 
3-locular, septifragal, equi-valved. Seeds go . 
Submerged herbs with the habit of Fontinalis and other aquatic 
mosses. Primary axis unknown ? Roots creeping, filamentous, attached 
by feet or haptera. Secondary shoots go , endogenous in the roots, 
often more or less paired on opposite sides, floating freely in the 
water, when developed in their highest form often long, many-flowered, 
and frequently branched, but often quite short, unbranched or nearly 
so, and 1-flowered or vegetative only. Branches of two kinds, long 
branches repeating the structui-e of the main axis, and short branches 
