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16.R.inicropiiS Kindb. cat. Canad. m. — R. heterostichum 

 var. occidentale Renauld et Cardot. 



Leaves long-acuminate greenish channelled with thick bor- 

 ders; cells yellcw gen. narrow, the uppermost sometimes sub- 

 quadrate; costa percurrent; hairpoint long. Capsule oblong 

 cylindric with short oblique beak; pedicel about 0,5 c. m. long. 

 Habit of B. microcarpum. — Granite rocks in alp. region r. 

 Amer. Pacif. distr. Can. Brit. Col. 2000 metr. a. sea: Macoun. 

 U. S.: Roell; Henderson, com. Cardot. 



4. LsevifoHa. 



A. Leaves channelled, thickened at upper borders. 

 IT.R.afflne Schleicher. — Trichostomum Schl.; Racomitrium 

 Lindb. 



Leaves ovate-lanceolate recurved below; upper cells round- 

 quadrate not or indistinctly sinuous; hairpoint short. Capsule 

 suboblong; teeth partite; pedicel about 1 c. m. long. Tufts 

 gen. not high and often dense. Stem often without short 

 branchlets. — Siliceous rocks not common. Eur. Norway, 

 Switzerl.l Sweden: Arnell. Amer. Can.: Macoun; Waghorne. 

 U. S.: Roell. 



* B.obtnsum Smith. — Trichostomum Sm.; Racomitrium Lindb. 



Leaves gen. obtuse without hairpoint. — Eur. Sweden: Arnell. 

 Norway: Bryhn. Amer. Can.: Macoun. 



B. Leaves carinate above with not thickened borders. 

 IS.R.heterostichum Hedwig. — Trichostomum H.; Racomi- 

 trium Brid. 



Leaves ovate- lanceolate acuminate recurved nearly all around; 

 cells as in the last; hairpoint often long. Capsule oblong- 

 cyliudric often somewhat large; teeth partite; pedicel 1 c. m. 

 or somewhat longer. Tufts us. grayish. Stem often with short 

 branchlets. — Quartzose stone princ. below alps. Eur. common. 

 Sweden, Norway, Switzerl.l Amer. Can.: J. Macoun. Alaska: 

 J. M. Macoun. U. S.: Henderson, com. Cardot. 



* R.niicropoides Kindb. n. subsp. 



Leaves pellucid with very short hairpoint; upper cells some- 

 times rectangular; alar cells hyaline. Capsule small scarcely 

 shorter than pedicel. — Rocks in alp. region r. Amer. Pacif. 

 distr. Can. Brit. Col.: Macoun. U. S.: Roell. 

 19.R.mici"0Carpiim Schrader. — Dicranum Schr.; Racomitrium 

 Brid. 



Leaves as in the last; cells narrow-rectangular distinctly 

 sinuous. Capsule small gen. suboval; teeth partite; pedicel short. 



