Mniiim.] BRYACE^. 245 



pendent, ovate-cylindrical, clustered (2 to 4) ; lid convex, 

 obtusely apiculate. — Sulliv. Icon. Muse. Suppl. 53, t. 37. 



Hab. Western side of the Rocky Mountains, and Vancouver Island ; 

 not rare. 



Mitten says that it differs from M. affine in its longer narrower leaves, 

 which are widely decurrent at base, while they are not at all decurrent in 

 M. affine. Sullivant rightly remarks that the distinction in the form of 

 the leaves is quite correct, but that in M. affine the leaves are always more 

 or less decurrent, and that it is therefore difficult to separate these species. 

 * * Leaves icith a thick doubly dentate margin. 

 H— Lid mamillate. 



9. M. hornum, Linn. Dioecious : plants densely cespitose, 

 densely radiculose below; stems simple, bearing at base a few 

 densely foliate flagelliforni branchlets : leaves gradually closer 

 and larger from tlie base upward, open, erect, slightly or not 

 at all decurrent, a little twisted Avhen dry, the lowest squami- 

 form with borders entire and costa reddish, the middle oval- 

 oblong, the upper oblong; outer perichietial leaves narroAvly 

 lingulate-spatulate, the inner lanceolate, all sharply acuminate 

 and firmly dentate ; capsule long-i^edicelled, horizontally inclined, 

 elli])tical, green when ripe and filled with the spores. — Si^ec. 

 PL 1112 ; Bryol. Eur. t. 890. 



Hab. More generally on quartz or schistose rocks; plains and moun- 

 tains. White Mountains {Oalces)\ mountains of North Carolina (Buck- 

 ley); Lancaster and Northampton Counties, Pennsylvania ( T. P. James) ; 

 Nova Scotia (N. B. James). 



■^■i- Lid rostrate. 



10. M. serratum, Laich. Bisexual : loosely cespitose ; 

 tufts soft, bright green ; stems short, slender, j^urplish, simple 

 or with slender basilar erect branchlets : leaves distant, decur- 

 rent, more or less twisted when dry, the lower ovate-lanceolate, 

 the upper oblong spatulate-lanceolate ; perichfetial leaves nar- 

 rowly lingulate-lanceolate, all acutely acuminate, with spinulose- 

 dentate margins, which are confluent at the apex with the 

 costa : capsule horizontally inclined, oval and oblong, pale yel- 

 low, purple at the orifice, soft ; lid pale. — PI. Eur. 478 ; Brid. 

 Muse. Recent, i. 3. 84, t. 1 ; Bryol. Eur. t. 391. Bryum serra- 

 tum, Schrad. Spicil. El. Germ. 71, in part (?). 3L marginatum, 

 Beauv. ; Lindb. Obs. Mniac. 46. 



Hab. Sandy borders of rivulets in woods; not rare. Not yet found 

 on the Western slope, as Urummond's n. 259, so named, is referred by 

 Schimper to the following species. But a close examination of the speci- 



