244 Podostemonacee. [ Hydrobryum. 
closely attached to the rock by hairs at all points, exogen- 
ously branched or lobed, ribbon-like or crustaceous lichen- 
like. Secondary shoots acropetally formed, endogenous, at 
first, in vegetative condition with included evanescent axis, 
later some or all floriferous, the axis emerging, apiscopic, 
and usually prostrate on the thallus, 1-flowered. Leaves in 
vegetative condition simple, subulate, up to 10 cm. long; 
in floral buds some of them ultimately forming scaly bracts 
by the enlargement of sheathing bases and fall of the leafy 
tips. Bracts 2-8, usually about 6, thicker or upper side. 
Spathe boat-shaped, enlarging at outer end, usually prostrate, 
and opening by a simple or compound slit on the upper 
side. Flower on emergence from spathe erect or nearly 
prostrate, stalked or sessile. Stamens 2 or 1, equalling or 
exceeding ovary. Pollen didymous. Ovary more or less 
globose; stigmas usually rather large, subulate or lobed or 
dentate, sometimes obcuneate, entire or lancerate. Fruit 
small or stalked, smooth or 8 or 12 ribbed, isolobous -or 
anisolobous, with many seeds. 
Thallus plate-like ; stamens short : . 1. H. OLIVACEUM. 
Thallus ribbon-like, branched; stamens of vary- 
ing lengths : j 2. H. LICHENOIDES. 
Page 418.—For Podostemon olivaceus Gardn. read: 
1. Hydrobryum olivaceum Tul. in Ann. Sc. Nat. |. c. p. 104 
(1849); Willis 1. c. pp. 239, 379 t. 32-36 (1902). Podostemon olivaceus 
and griseus Gardn. in Calc. Journ. Nat. Hist. VII, p. 181 (1846). 
Talawakele. 
Also in S. India (var. anamalaiense Willis). 
2. H. lichenoides Kurz, in Journ. As. Soc. Beng. XII, p. 103 
(28.5.73); Willis 1. c. pp. 242, 375 t. 28, 31-2 (1902). Podostemon 
acuminatus and microcarpus Wedd. in DC. Prodr. XVII, pp. 75 and 
76 (16.10.73): 
Primary axis short, with few leaves, non-floriferous. 
Thallus ribbon-like, up to 15 cm. long, regularly branched. 
Branches acropetal, alternate, again branched with the first 
secondary lobe on the basiscopic side. Secondary shoots 
numerous at axils and on sides of thallus lobes, in vegetative 
condition with leaves 3-6 mm. in flowering condition pros- 
trate or rarely erect, with 4-8 scaly bracts with deciduous 
tips. Spathe boat-shaped, dehiscent on upper side, the de- 
hiscence sometimes beginning at the tip, or forming an 
upper smaller and lower larger lobe. Flower sessile or 
shortly stalked. Stamens 2, or rarely 1, equalling or exceed- 
ing the ovary and stigmas. Staminodes shorter than the 
ovary. Ovary globose or ellipsoidal; stigmas ovate to subu- 
late or to obcuneate, usually more or less lobed or toothed, 
or even lacerate. Pedicels of ripe fruit 1-8 mm.; capsule 
Part IfiI. 
