122 CX. PODOSTEMACEZ (BAKER AND WRIGHT). [ 7risticha. 
broadly ovate to elliptic, usually trifarious, about 4 lin. long, the upper 
sometimes longer and narrower. Flowers solitary, terminal on short 
branches near the apex of the stem; peduncle up to 9 lin. long in fruit, 
terete, rigid, erect. Perianth-segments 3, equal, oblong-elliptic, cymbi- 
form, pellucid. Filament compressed; anthers ovoid, obtuse. Ovary 
shortly stalked, ellipsoid, trigonous. Capsule ellipsoid, 1 lin. long; 
valves 3-nerved.—Weddell in DC. Prodr. xvii. 44; Tulasne in Ann. 
Sci. Nat. 3™¢ sér, xi. 112,in Arch. Mus. Hist. Nat. Par. vi. (1852), 186, 
and in Mart. Fl. Bras. iv. i. 272; Engl. Hochgebirgsfl. Trop. Afr. 228; 
Warming in Kgl. Danske Selsk. Skrifter, ser. 6, ix. ii. 107, figs. 1-6, 
and xi. i. 28, 61, figs. 20-23, excl. syn. 7. trifaria. 7. bryoides, Gardn. 
in Cale. Journ. Nat. Hist. vii. (1847), 178, and Wight, Ic. t. 1920. 
T. Philocrena, Steud. Nomencl. Bot. ed. 2, ii. 715. 7’. alternifolia, var. 
pulchella, Warm. |.c. xi. i. 36. Dufourea hypnoides, A. St. Hil.in Mém. 
Mus. Paris, x. (1823), 472. Philocrena pusilla, Bong. in Mém. Acad. 
Pétersb. 6™° sér. i. (1832), 80, t. 6. 
Upper Guinea. Northern Nigeria: Nupe; on rocks near Ketsa, Barter, 1093! 
rocks of the River Awou, an affluent from the Yoruba country about 5 miles from 
the River Kworra (Niger), Barter, 1530! Chutes de Billy, Chevalier, 65! Fernando 
Po: in a rivulet near Clarence, Barter, 2073! Mann! 
Nile Land. Sudan: creeping on stones in the River Biri at Meshra Yoro 
Shamo, Broun, 1632! Abyssinia: Begemeder; Silen Uha, Schimper,1381! Mittu: 
Woko River near Koro, Schweinfurth, 2859 ! é 
Lower Guinea. Angola: between Huilla and Humpata, Jolnston ! 
Mozamb. Dist. Portuguese East Africa: Lower Zambesi; near “ Mungozi,” 
Shupanga, Kirk ! 
3. T. alternifolia, Thouars ex Spreng. Syst.i. 22. Plant much 
branched from the base, fixed to rocks by a dull rosy or purple thallus. 
Stems terete or only slightly compressed, at first erect, afterwards 
floating with the current, up to 10 in. long, reddish-purple, semipellucid ; 
branches filiform. Leaves trifarious, at first densely packed, at length 
distant, oblong-linear, 1 lin. long, + lin. wide, the lower slightly 
spreading, the upper erect and imbricate. Flowers solitary in the 
axils of branches near the top of the plant or terminating short 
branches. Perianth-segments green, ovate-oblong, concave. Anther 
red, ovate-oblong, emarginate at the base. Capsule reddish-brown, 
oblong-ovoid, 1 lin. long; valves 3, 3-ribbed; peduncle 6 lin. long, 
slender.—Tulasne in Ann. Se. Nat. 3™° sér. xi. 111, and in Arch. 
Mus. Hist. Nat. Par. vi. (1852), 182; Wedd. in DC. Prodr. xvii. 49; 
Warming in Kgl. Danske Vidensk. Selsk. Skrifter, ser. 6, xi. i. 31, 61, 
62, figs. 25-30. 7’. hypnoides, var. fontinaloides, Wedd. in DC. Prodr. 
xvii. 45; Hiern in Cat. Afr. Pl. Welw. i. 907. 7’. fontinaloides, Welw. 
ex Wedd. l.c. Dufourea alternifolia, Willd. in Ges. Naturf. Fr. Berl. 
Mag. vi. (1812), 64; Roem. & Sch. Syst. i. 50. 
Lower Guinea. Congo, without precise locality, Deweni, 902, 997 (ex Warm- 
ing). Angola: in the Presidium, on submerged stones in the clear mountain 
streams of Pedra de Cabondo, Welwitsch, 527! 
