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faintly mamillose above; upper cells narrow, the lower dilated, 

 the alar yellow; costa vanishing in acumen. Capsule large eub- 

 cylindric arcuate; lid rostellate-apiculate; pedicel very long. 

 Perichetial leaves plicate. Tufts loose. Stem pinnate very 

 tomentose; branches distant; paraphyllia numerous. — Wet cal- 

 careous places. Eur. common below alp. regions. Sweden, 

 Norway, France, Switzerl.! Amer. r. »U. S.»: Lesq. et. Jam. 



* H.siilcatam Schimper. 



Stem less regularly pinnate; branches less distant. Leaves 

 smaller, short-decurrent; their costa shorter. Capsule smaller. 

 — Alpine, often not calcareous, stations. Eur. somewhat r. 

 Norway, Switzerl.! Amer. r. »Greenl.»: Berggren. N. Foundl.: 

 Waghorne. 

 2.H.decipiens Notaris. — Thuidium Not.; Hypnum Kindb. 



Differs from H. commufatum: Leaves gen. mamillose on both 

 sides, with broader base and shorter acumen, less striate; alar 

 cells gen. hyaline; cells shorter, those of branch-leaves oval- 

 oblong; costa shorter, faint above. Perichetial leaves shorter, 

 faintly striate. Stem often sparingly tomentose; branches often 

 simple above. Very r. fruiting. — Rivulets, princ. in alps, 

 also in not calcareous districts, gen. r. Eur. Sweden, Norway, 

 Switzerl.! Amer. Can.: Macoun; Waghorne. 



B. Leaves crowded, not decurrent, nearly entire; alar cells 

 not large. 

 S.H.falcatum Bridel. 



Leaves from ovate-oblong base long-acuminate, often striate, 

 indistinctly mamillose, cells sublinear; costa us. vanishing in 

 acumen. Perichetial leaves plicate. Capsule less large than in 

 H. commutatum; lid with shorter point. Tufts brown or dark 

 green, often dense. Stem us. irregularly pinnate and sparingly 

 tomentose; branches approached. — Swamps and rivulets princ. 

 in not calcareous alp. stations, Eur. common in alps. Sweden, 

 Norway, France, Switzerland! Amer. Can. not r.: Macoun. 



* H.irrigatum Zetteretedt. — H. virescens Boulay. 



Leaves ovate-lanceolate faintly striate; alar cells us. not well- 

 defined; costa of stem-leaves gen. percurrent. Tufts dirty greeen. 

 Stem often pinnate, sometimes naked below; paraphyllia few. 

 Very r. fruiting. — Rivulets r. Eur. Sweden, Norway, Switzerl.! 



11. Cratoneuron Sullivant, in part. 

 l.H.fllicimim L. — Amblystegium Notaris. 



Leaves minutely denticulate all around; alar cells large us. 

 hyaline; costa not thin in the acumen, sometimes excurrent. 



