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Stem-leaves subovate acuminate decurrent. Branch-leaves narro- 

 wer, gen. more crowded; cells suboblong. Perichetial leaves 

 gen, not striate. Capsule subcylindric arcuate, smaller and 

 shorter-pedicellate than in H. commutatum. Tufts us. dense and 

 dirty green. Stem often creeping; branches us. crowded; ])ara- 

 phyllia often present. Dioecious. — Wet places, common. Eur. 

 Sweden, Norway, Germany, Switzerl.! Eur. Can. Macoun. 



* H.curdcaule Juratzka. 



Leaves gen. not falcate; alar cells yellow; stem-leaves short- 

 acuminate. Stem nearly eradiculose. — Alps r. Eur. Norway: 

 Bryhn; E. Nyman. Austria: Breidler. Switzerl.: Culmann. 



* H.Tallis-clausae Bridel. — Hypnum Formianum Schimper. 



Leaves long-acuminate; cells less dilated; costa excurrent. 

 Stem long, often denudate below and covered bj' persistent 

 nerves. — Running water r. Eur. !>France»: Boulay. »Italy»: 

 Schimp. syn. 



* H.fallax Bridel. — Amblystegium irriguum var. spinifolium 

 Schimper. 



Upper leaves ovate-lanceolate loug-acuminate nearly entire; 

 costa excurrent. Stem as in the last. — Running water r. 

 Eur. Sweden! Engl.: Rogers. Germany: Roemer. 

 S.H.fluTiatile Swartz. — Amblystegium Br. eur. 



Leaves gen. entire, ovate-oblong or ovate-lanceolate, acute or 

 short-acuminate, not or indistinctly decurrent, us. not falcate 

 and not distant, dark green; cells lanceolate-oblong, the small 

 alar gen. not much distinct; costa subpercurrent. Capsule as 

 in the last. Stems not or sparingly radiculose, gen. irregularl}' 

 divided and not tufted; branches long; paraphyllia none. Very 

 r. fruiting. — Inundated rocks. Eur. not r. Siyeden, Germany! 

 Amer. Can.: Macoun. U. S. r.: Austin. 

 *H. irriguum Hooker et Wilson. — Amblystegium Br. eur. 



Leaves sinuolate-denticulate, from subovate base long-acumi- 

 nate, subdecurrent, somewhat distant and patent; alar cells 

 distinct; costa subexcurrent. Stem us. rigid when dry. — 

 Eur. not common. Sweden, Germany, Switzerl.! Amer. Can.: 

 Macoun; Waghorne. U. S.: Austin. 



III. Harpidium SuUivant. 

 1. Riparia. 

 G.H.riparium L. — Amblystegium Br. eur. 



Leaves ovate-binceolate gradually acuminate sometimes filiform- 

 pointed, entire, scarcely decurrent, us. distant and large; middle 

 cells, also often the upper, narrowly linear; costa r. percurrent. 



