494 EXTODONTACEAE. 



appressed Trhen dry, spreading when moist, small, up to 1.5 mm. long by 1 mm., 

 broad at the aurided base; vein ending in the middle of the leaf; apex acumi- 

 nate; margins entire, with projecting papillae; cells spindle-shaped with thick 

 walls and 3-4 small papillae; basal cells longer and narrower, smooth and 

 radiating toward the margins, Dioicous. [Perichaetial leaves pale, erect, 

 lanceolate-subulate, plicate but not papillose; seta exserted up to 1 cm. long; 

 capsule ovoid, about 2 mm, long; calyptra pale and hairy; lid beaked; mouth 

 small with a dark rim; peristome pale, papillose; teeth lanceolate with a median 

 line, inner membrane short with pale slender segments, more or less adherent 

 to the teeth; spores brown, mature in summer.] Only known from sterile 

 specimens in the Bahamas. 



On twigs and trunks of trees in coppice, New Providence : — Florida ; Louisiana ; 

 West Indies and southern California to Panama and South America, Blackish 

 Papillaria. 



Family 11. ENTODONTACEAE Brothems. 



ExTODOX Family. 



Plants growing in glossy flat mats, either on rocks or trees. Stems 

 creeping, usually with simple branches. Leaves spreading or flattened, 

 nsiially crowded; vein single or double, rarely lacking; cells mostly longer 

 than broad; often with the ends thickened and projecting on the back of 

 the leaf, with the alar transversely elongated. Autoicous or dioicous. 

 Pedicel erect, exserted; capsule cylindric, mostly erect and symmetric; lid 

 usually short-beaked; calyptra cucullate, smooth; peristome double, often 

 deeply inserted; teeth longer or shorter than the inner keeled segments, 

 variously thickened; cilia usually lacking; annulus present or absent. A 

 large family, of about 20 genera, w^idely distributed in temperate and trop- 

 ical regions. 



1, STEREOPHYLLUM Mitt. Journ. Linn. Soc. Suppl. 1: 117. 1859. 



Plants growing in thin flat mats, on rocks or trees. Stems creeping and 

 rooting, with simple irregular branches. Leaves crowded, somewhat flattened 

 and glossy; apex acute or obtuse; vein stout or lacking; margins flat, entire 

 or rarely toothed at apex; base unequal, one side composed entirely of quadrate 

 alar cells; upper cells short or long, often with the thickened end-walls forming 

 minute papillae. Autoicous or rarely dioicous; pedicel elongated; capsule 

 erect to inclined, and unequally ovoid; lid conic-beaked; annulus lacking; peri- 

 stome double, the outer papillose with thickened joints above, the inner nar- 

 rower from a short basal membrane, without cilia. A genus of 61 species, 

 widely distributed in tropical and subtropical regions of both hemispheres. 

 [Greek, in reference to the thick leaves,] Type species: Pterygophyllum 

 indicnm Belang. 



1. Stereophyllum radiculosum (Hook.) Mitt. Journ. Linn, Soc, 12: 542. 1869. 



Bool-eria radicuUsa Hook. Musci. Exot. pi. 51. 1818-1820. 



Homalia Wrigliiii Sull. in A. Gray, Man. ed. 2, 665. 1856. 



Plants in fiat bright green mats. Stems matted together by numerous 

 radicles; branches and branchlets with flattened glossy leaves, imbricate and 

 secund when dry, spreading when moist, up to 1,75 mm. long by 0,75 mm. 

 broad, concave with flat serrate margins; vein stout, tapering and ending above 



