— 268 — 



97.B.horridifolia C. M. et Kindb. 1. c. 



Differs from the both last and B. vinealis in leaves faintly 

 papillose loosely disposed long-decurrent. Leaves from ovate 

 base narrowed to a longer and long-subulate acumen, falcate 

 when moist, crisped or spreading when dry; basal cells pellu- 

 cid short-rectangular, the inner larger; costa broader below 

 vanishing in apex, not excurrent. Capsule cylindric; teeth red- 

 dish scarcely more than once contorted with long in dry state 

 spreading points. Tufts somewhat high, brown or rusty red 

 below, greenish at tops. — Damp rocks r. Amer. Can. PaciL 

 distr.: Macoun. 

 98.B.tOrtelIifolia C. M. et Kindb. 1. c. 



Differs from the last: Leaves broader, less distinctly decurrent; 

 the comal larger and crowded with short-excurrent costa. Pe- 

 richetial leaves suddenly tapering to a long narrow acumen; 

 costa slightly excurrent. Peristome whitish. Tufts often higher 

 sometimes quite red. — Wet rocks. Amer. Pacif. distr. princ. 

 near sea. Can. less r.: Macoun. 



b. Leaves also the uppermost nearly smooth; upper cells 

 pellucid well-distinct. 

 99.B.robustifolia C. M. et Kindb. 1. c. 



Leaves shorter and more crowded than in the last, from 

 ovate base narrowed to the subulate acumen, reflexed nearly 

 to middle at one side, falcate or crisped; basal cells subquadrate 

 hyaline; costa equally broad and distinct to apex, not excur- 

 rent. Capsules unknown. Tufts dark brown or olive-green. 



— Rocks r. Ame): Pacif. distr. Can.: Macoun. U. S.: Roell. 



110. Ceratodon Bridel. 



A. Leaves carinate. Outer perigonial leaves long-acuminate 

 acute. 

 l.C.purpureus L. — Mnium L.; Ceratodon Brid. 



Leaves reflexed nearly all around, entire or sHghtly denticu- 

 late near apex, gen. not decurrent, us. broadly ovate-lanceolate 

 attenuate not subulate at apex; cells small us. chlorophyllose; 

 costa us. percurrent. Inner perichetial leaves (1 or 2) obtusate 

 or short- acuminate. Capsule sometimes strumose us. curved 

 when dry; teeth with numerous articulations, often marginate; 

 lid elongate- conic; pedicel red. Outer perigonial leaves with 

 scarcely excurrent costa. Tufts us. not tomentose. Dioecious. 



— Gravelly soil. Eur. common. Sweden elc.l Amer. Can.: 

 Macoun. 



