— 343 — 



le.M.arcticum Kindb. in Biblioth. botan. 42 (1897). 



Lower leaves decurrent with long ciliiform teeth, oblong 

 obtuse; the uppermost oblong-lanceolate short- acuminate acute; 

 outer perichetial ovate-lanceolate long-acuminate acute. Cap- 

 sule solitary small (as in M. cuspidatum) suboval; pedicel not 

 long. Tufts loose, about 2 c. m. high. Shoots erect. Dioe- 

 cious. Habit of M. cuspidatum. — Arctic district r. Amer. 

 Greenl. Karajak-Nunatak: Vanhoeffen. 



6. Rostrata. 

 17.M.rostratnm Sohrader. 



Leaves not or slightly decurrent: lower small rotundate or 

 broad-oval; upper oval or broadly obovate obtuse, entire below. 

 Capsules yellowish often clustered. Tufts loose. — Rocks 

 and stonewalls. Eur. not r. in lower distr. Sweden, Switzerl.l 

 Amer. Can. not uncommon: Macoun. 



7. Undulata. 

 IS.M.undnlatum Weis. 



Leaves decurrent obtuse dentate all around. Capsules often 

 clustered. — Wet woods in lower distr. Eur. nearly common. 

 Sweden!; J. Pereson, Denmark: M. F. Lange. Greece: Heldreich. 



8. Spinosa. 



19.M.spinosuni Voit. — Bryum Voit; Mnium Schweegrichen. 



Leaves curled when dry: upper subobovate; inner perichetial 

 UB. doubly dentate limbate. Tufts dark green loosely cohering. 

 Dioecious. — Earth and rocks in woods, sometimes in alps. 

 Eur. not uncommon. Norway, Switzerl.l Amer. r. »U. S.»: 

 Lesq. et Jam. 

 20.M.spinulosum Bryol. eur. 



Leaves not or slightly curled: upper subobovate; inner peri- 

 chetial us. simply dentate and not limbate. Tufts bright green 

 densely cohering. Synoecious. — Base of trees. Eur. r. Austria: 

 Schimper. Prance: Husnot. Germany: Progel. Amer. not r. 

 Can.: Macoun; Dawson. 

 * M.macrociliare C. M. et Kindb. 1. c. 



Leaves dark-green smaller; , teeth more cihiform, sometimes 

 simple. Capsule solitary. — Amer. r. Can.: Macoun. 



9. Serrata. 



A. Synoecious or paroecious without special male plants. 

 Stem us. radiculose between lower leaves. 

 21.M.raarginatuni Dickson. — Bryum Dicks. 1790; Mnium 

 Beauvois; M. serratum Schrader ? (1791); Br. eur. 



Leaves long-decurrent; costa scarcely percurrent. Upper 



