Homalothecium.] BRYACE^. 309 



symmetrical ; lid rostrate from a conical base ; teeth distantly- 

 articulate; segments yellow, cleft and bifid, attached to a broad 

 membrane ; cilia none : spores bright yellow. — Bryol. Eur. 

 JPi/laiscea, 3 ; Sulliv. Icon. Muse. 137, t. 87. -P. dentiadata, 

 Sulliv. Mosses of U. States, 62. 



Var, obscura. Plants dirty green ; tufts strong, compact : 

 leaves closely imbricate, shorter; the perichaetial short-acumi- 

 nate, entire : lid short, whitish. — P. Jamesii, Sulliv. & Lesq. 

 Muse. Bor.-Amer. Exsicc. ed. 2, n. 383. 



Hab. On the bark of trees, Central Ohio {Sullivant); New Jersey 

 {Austin} ; the variety on the ground and roots of trees, near Chelsea, Mas- 

 sachusetts (James). 



Sullivant remarks, 1. c, that the species is very near slender forms 

 of P. poli/antha, distinguished by the larger shorter-pointed leaves, the 

 cells broader and shorter, those of the angles more numerous, and the 

 beak of the lid longer. 



4. P, intricata, Bruch & Schimp. Size and mode of 

 growth as in jP.. suhdenticulata / branches short, recurved : 

 leaves ovate-lanceolate, acuminate, slightly denticulate at the 

 apex, the upper secund ; angular cells quadrate, numerous : 

 capsule oblong-ovate, turgid, narrower at the orifice ; operculum 

 conical, short-rostellate ; segments granulated, adhering to and 

 bordering the lower half of the teeth, split above and free, as in 

 species of Bartramia: spores large. — Bryol. Eur. Pylaiscea, 

 3 ; Sulliv. Mosses of U. States, 62, and Icon. Muse. 139, t. 88. 

 PterigynandrxLm intricatum, Hedw. Spec. Muse. 85, t. 18. 



Hab. Trees and old logs; common in woods. 



5. P. velutina, Bruch & Schimp. 1. c. Differs from the 

 last, with which it has often been confounded, in the somewhat 

 narrower leaves with few quadrate alar cells, the capsule cylin- 

 drical with a broad orifice and longer operculum, the teeth more 

 densely articulate, narrowly bordered their whole length by the 

 adhering segments, and the spores dark yellowish green, larger 

 and granulated. — Sulliv. Mosses of U. States, 63, and Icon. 

 Muse. 140, t. 89. 



Hab. Bark of trees ; often growing with the last. 



124. HOMALOTHECIUM, Bruch & Schimp. (PI. 5.) 

 Plants varying in size, prostrate, closely and pinnately 

 branched. Leaves glossy, costate, serrulate ; areolation oblong- 



