Tristicha] cv. podostemace.e. 907 



1. TRISTICHA P. Thouars in Roemer, Collect. Bot. p. 197. 

 n. 8 (1809); Benth. & Hook. f. Gen. PI. iii. p. 108. 



1. T. hypnoides Spreng. Syst. Yeg. iv. Cur. Post. p. 10 (1827). 

 Var. fontinaloides Wedd. in DC. Prodr. xvii. p. 45 (1873). 



T. fontinaloides Welw. ex Wedd., I.e. 



PuNGO Andongo. — An aquatic herb, 3 to 10 in. long, branched in a 

 dichotomous or fasciculate manner like Fonthmlh antipyretica, attached 

 after the fashion of the Florideae, with a shield-like cartilaginous 

 sordid-rosy or purplish callus, to the submerged rocks in clear streams, 

 when removed from the water rapidly becoming very limp ; stems 

 several from the same root, casspitosely clustered, the young ones erect, 

 subcompressed, greenish purple, the older and fruiting ones floating, 

 flatly compressed, reddish purple, subcartilaginous and as the branches 

 and branchlets (which are at length subcylindrical) semipellucid and 

 flexible, in youth more densely and in adult age more loosely leafy ; 

 leaves alternate, apparently distichous but really trifarious, those of 

 two rows distichously patent, those of the third row shorter, erect, 

 adpressed to the stem, almost imitating the amphigastria of Junger- 

 manni^e, all very brightly deep-green, oblong-lanceolate, obtuse, 

 1 -nerved, quite entire, narrowed and sub-decurrent at the base ; 

 flowers axillary, solitary, at first subsessile and involucrate with 

 bracteoles, soon with firm rather thick straight and long peduncles ; 

 bracteoles at length oblong, rather broad, membranous, 2 or 3, usually 

 2, at the base of the peduncle at length free, spreading, persistent in 

 fruit ; perianth-segments 3, thinly chartaceous, green, at first sub- 

 connate beyond the middle, at length as the ovary enlarges free to the 

 base, equal, ovate-oblong, concave, adhering to the mature ovary, persis- 

 tent, then spreading, but little or scarcely exceeding the capsule ; stamen 

 1, hypogynous ; filament compressed-filiform, at the beginning of the 

 flowering included, soon rather far exserted ; anther 1, terminal, red, 

 attached at the emarginate base, ovoid-oblong, 2-celled, dehiscing 

 longitudinally ; ovary ovoid, incompletely (?) 3-celled, the cells with 

 several ovules ; stigmas 3, purple, filiform, erect during the flowering, 

 at length diverging ; capsule brick-red-brown, oblong-ovoid, crowned 

 at the top with the indurated styles, longitudinally sulcate-costat;., 

 3-valved ; the valves tricostate, boat-shaped, when dehisced laying 

 bare a placentiferous column which bears the erect seeds in its 

 depressions ; seeds very numerous, elongate-ellipsoidal, compressedly 

 biconvex ; testa thin, pellucid, somewhat viscid ; the inner lining bright 

 brown, very delicately and roundly foveolate. On submerged stones 

 in the clear mountain streams of Pedra de Cabondo, in the praesidium ; 

 sparingly fruiting, Feb. 1857. No. 527. 



The Alga n. 109, and perhaps also n. 108, grew on the branchlets. 



2. T. trifaria Tulasne in Ann. Sc. Nat., ser. 3, xi. p. Ill (1849). 

 Dufourea trifaria Bory ex Willd. Sp. PL v. p. 55 (1810). 

 PuNGO Andongo. — A herb with the habit of a Jungermannia, 



growing on submerged rocks in cold streams, at first erect, afterwards 

 as the stem branches more or less elongated, somewhat floating, at 

 length as the water in the streams dries up decumbent on the rocky or 

 muddy-sandy bottom and in this state mostly fruiting, just as in 

 mosses the luxuriant specimens rather rarely flowering or fruiting, 

 firmer and more rigid than the last species ; root scutiform, cartila- 

 ginous, reddish, closely adhering to the matrix ; stems compressed- 

 flat, occasionally even much dilated, csespitose, in the living state tinged 



