Distichium.] BETACEyE. 93 



Calyptra long, narrow. Capsule narrowly C3'lincTrical, regular 

 or subarcuate, thin, smooth. Operculum short-conical. Peri- 

 stome large, jjurple, with the segments of the teeth nearly equal, 

 nodose at the articulations and minutely granulose. Annulus 

 large, revoluble. 



Eelated, like Ceratodon, to Dicranum in the mode of growth; to Lepto- 

 trichum in the form of the capsule and structure of the peristome. 



1. T. cylindricus, Schimp. Stem one cm. long: leaves 

 fiexuous, squarrose, curling: capsule dusky. — Coroll. 36. 

 Trichostomiim cylinclHcum, Hedw. Sp. Muse. 107, t. 24, figs. 

 7 to 13. Didytnodon cylindricus, Wahl. ; Sulliv. & Lesq. 

 Muse. Bor.-Am. n. 106'' (not Bruch & Schimp, ; Watson, Bot. 

 Calif, ii. 366, excl. hab.). Ceratodon cylindricus, Bryol. Eur. 

 t. 192. Ditrichuni tenuifolium,JAn(\k).\ Braithw. Brit. Moss- 



FI. i. 97, t. 14, E. 



Hab. On old wood and twigs, Chester Co., Pennsylvania, fruiting; 

 Alleghany County and White Mountains, sterile [James) \ Nevada 

 (Watson)\ Ontario [Mrs. Roy). 



31. DISTICHIUM, Bruch & Schimp. (PI. 2.) 

 Plants densely cespitose, glossy. Stems slender, repeatedly 

 dichotomous and fastigiate. Stem-leaves exactly distichous, 

 spreading and subulate from the half-clasping base, broadly cos- 

 tate. Flowers moncecious ; antheridia enclosed in a j^erigoniura 

 of two or three leaves, or more generally free in the axils of 

 the upper leaves, long, narrow, with long parajihyses ; peri- 

 choetiura terminal. Capsule erect or subcernuous, coriaceous, 

 glossy. Lid conical. Teeth linear-lanceolate, either nearly 

 entire or bifid or irregularly lacerate, punctulate, reddish. 

 Annulus simple, large, deciduous. 



1. D. capillaceum, Bruch & Schimp. Tufts dense, 

 tomentose, silky green above : leaves long-subulate from the 

 clasping base, broad, concave-oblong, open and fiexuous, very 

 entire ; perichaetium of two long sheathing leaves : capsule 

 generally erect, regular, oblong-ovate, smooth (not furrowed) 

 when dry; teeth narrow, irregular, bifid or lacunose. — Bryol. 

 Eur. t. 193. Bryum 7nontanum, Lorn. Fl. Fr. i. 48. Swartzia 



