— 33 — 



2.C.aiiiericaiiTim Bridel; SuUivant icon, muscor. 



Stem-leaves obtuse entire long-decurrent gen. broad-ovate; 

 costa subpercurrent. Branch-leaves acute ovate-oblong cordate, 

 denticulate from base, sharply serrate above middle; inner basal 

 cells somewhat dilated. Perichetial leaves nerveless. Capsule 

 long-cylindric; lid long- rostrate; teeth orange-red. Often fruiting. 

 — Logs and roots of trees. Amer. common princ. in Pacif. 

 distr. Alaska: J. M. Macoun. Can.: J. Macoun. U. S.: Sullivant, 

 com. C. Mueller; A. G. Wetherby; com. Renauld and Cardot. 



In a variety (C americanum var. Kindbergii Renauld et Car- 

 dot) leaves are shorter and broader; those of stem rotundate- 

 ovate, those of branches ovate. — Amer. U. S.: com. Renauld 

 and Cardot. 



35. Alsia Sullivant. 

 l.A.longipes Sullivant et Lesquereux; Sulliv. icon. m. 



Stem-leaves obtusate ovate-oblong denticulate above; branch- 

 leaves ovate-lanceolate acute, obtusate or short-acuminate, serrate 

 above, entire and recurved below; upper cells round-oval, lower 

 suboblong; costa dentate above at back, reaching to acumen. 

 Capsule cylindric erect; segments rimose; cilia appendiculate; 

 lid rostrate. Branches pinnate slightly curved, not much tur- 

 gid. Dioecious. — Rocks r. Amer. U. S.: Bolsender, com. Re- 

 nauld. 



2.A.circilinata Bridel. — Hypnum Brid.; Alsia Kindb.; Eu- 

 rhynchium Bryol. eur. 



Lower stem-leaves from broad-ovate base long-acuminate, 

 minutely denticulate; upper cells lanceolate-linear, lower oblong- 

 lanceolate ; costa vanishing in acumen. Branch-leaves small 

 ovate-oblong acute, serrate above, denticulate and recurved below; 

 inner cells gen. suboblong, middle suboval; costa subpercurrent 

 dentate at back. Capsule subovate inclined or horizontal, not 

 or slightly curved; segments split; cilia and lid as in the last. 

 Branches turgid circinnate subpinnate. Dioecious r. fruiting. 

 Habit of Isothecium Breweri and Pterogonium. — Earth and 

 stone r. Eur. Italy: Bottini; Roell; Arcangeli. France: Henry, 

 com. Husnot. Engl.: Curnow. Irel.: Holt. 



Scorpiurium riyale Schimper, differing in ovate obtusate 

 entire leaves with suboval cells, is by Prof. Boulay regarded 

 as a state of this species. ■ — ■ In water r. Eur. France: Boulay, 

 com. Husnot. 



36. Isothecium Bridel. 



A. Branches not compressed. 



