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middle, with double mamillse, gen. appressed when diy, smaller 

 than in Ph. calcarea. Perigonial leaves horizontally spreading. 

 Tufts not high; fruiting stem very low. — Amer. r. Can.: Ma- 

 coun. U. S.: Eoell. 



b. Perigonial leaves gen. all obtuse subovate, the inner not 

 distinctly costate. 

 ll.Ph.fontana L. — Mnium L.; Philonotis Bridel. 



Leaves plicate below, us. with numerous double mamillse, 

 mostly crowded: perigonial obtuse patent-erect. Tufts us. glau- 

 cous green. — Wet places common and very veriable. Eur. 

 Sweden, Norway, Switzerl.! Greece: Heldreich. Amer. Can.: 

 Macoun; Waghorne. 

 *Ph.seriata Mitten. — Bartramia Mitt.; Philonotis Lindb. 



Shoot-leaves gen. distant, spirally twisted when dry. — Ri- 

 vulets in alps not common. Eur. Norwayl France: Gasilien, 

 Amer. Can.: J. Macoun. Alaska: J. M. Macoun. 

 * Ph.gracilescens Schimper. — Ph. fontana *angustifolia Kindb. 

 Laubm. Schw. u. Norw. 



Leaves (nearly all) small and narrow, often not recurved, 

 those of shoots gen. distant: perigonial subacute at least the 

 outer. Stem somewhat thin. Habit of Ph. marchica. — Wet 

 rocks princ. in alps. JEur. not common. Sweden, Norway! 

 France: Husnot. Spetsbergen: R. Gyllencreutz. 



C. Perigonial leaves not seen. Other leaves not plicate. 

 12.Ph.Mohrii C. M.; Bartramia C. M.; Philonotis Lq. et Jam. 



Leaves crowded, resembling those of Ph. fontana, but minutely 

 serrulate above, gen. with double mamillse below, not distinctly 

 plicate, reflexed below, straight, open also when dry; costa 

 long-excurrent. Capsule faintly plicate when dry; lid umbonate. 

 Stem not high; pedicel as long. — Rotten logs r. Amer. U. S.: 

 Louisiana: Mohr, com. C. Mueller. 

 iS.Ph.adpressa Fergusson; Braithwaite. 



Leaves with gen. double mamillse, broad-ovate uniform, distant 

 decurreut nearly appressed when dry; costa gen. not excurrent. 

 Tufts long loose nearly eradiculose. Capsules unknown. — 

 Wet places r. Eur. »Engl.»: Braithwaite. Amer. Greenl.: Van- 

 hoeffen. 



IL Philonotula C, Mueller. 



A. Leaves serrulate all around, narrowly ovate-lanceolate. 



a. Leaves subulate at apex; costa excurrent. Monoecious. 

 14.Ph.rigida Bridel. 



Leaves faintly papillose or mamillose nearly crowded, us. 



