— 323 — 



l.B.stricta Bridel. 



Capsule gen. erect; peristome simple; pedicel exserted. Tufts 

 glaucous green above. Synoecioue. — Siliceous ground r. Eur, 

 princ. in Mediterr. distr. France: Schimper. Italy: Bottini. 

 Amer. »U. S.»: Lesq. et Jam. 



B. Leaves abruptly narrowed from the not refiexed us. 

 hyaline sheath; costa more or less filling subula. 

 2.B.ith}pliylla Bridel. 



Capsule inclined; peristome us. double. Costa of leaves not 

 well-defined above but us. not wholly filling subula. Tufts us. 

 glaucous green. Synoeoious. — On stone. Eur. common. Swe- 

 den, Norway, Switzerl.l Amer. Greenl.: Vanhoeffen. Alaska: 

 J. M. Macoun. Can.; J. Macoun; Waghorne. 

 * B.breviseta Lindberg. 



Capsule deflexed when young, suberect when old; peristome 

 simple rudimentary or wanting; pedicel scarcely exserted. Costa 

 filling subula of leaf. — Northern princ. arctic district r. Eur. 

 »Norway: Th. Fries »: Lindberg. Amer. Alaska: J. M. Macoun. 

 Can.: Waghorne. 

 *B.rigidula (Schimper as var.) Kindb. n. subsp.) 



CapsAle smaller; pedicel exserted. Leaves rigid brittle ap- 

 pressed when dry. — Alp. and arctic distr. r. Eur. Norwayl 

 Amer. » Greenl. »: Lange. 



3.B.Tiridissima Bridel. — »Weisia Brid. 1826 »: Limpr. — 

 B. subulata Br. eur. 1846. 



Differs from B. ithyphylla: Capsule smaller, erect when moist; 

 peristome simple rudimentary us. wanting. Leaves smaller; 

 costa often not defined in subula. Paroecious. — Rocks in 

 higher alp. and arctic distr. r. Eur. Switzerl.l Austria; Breidler. 

 Amer. Greenl.: Vanhoeffen. »Alaska and U. S.»: Lesq. et Jam. 



2. Crispse. 



A. Upper leaf-cells short-rectangular. Leaves crowded very 

 distinctly sheathing, more or less flexuous but not crisped. 

 4.B.iiorvegiea Gunner. — Bryum Gunn. 1772; Bartramia Lindb.; 

 Webera Halleri Hedwig 1782; Bartramia Hedw. 1789. 



Leaves not decurrent, abruptly tapering and long-subulate; 

 costa long-excurrent. Pedicel not much longer than capsule. 

 Monoecious or subparoecious. — Eocks often near cascades. 

 Eur. not r., nearly common in alps. Sweden, Norway, Switzerl.l 

 Amer. r. »Can. Rocky mts: Drummond»: Lesq. et Jam. 



B. Upper leaf-cells subquadrate. Leaves crisped or circinnate, 

 a. Leaves crowded, not distinctly sheathing. 



