N. Y., N. J., O., Va., W. Va., Wis. On stones along the 

 Bronx river, Bronx Park. 



Var. datum B. S. In bogs and swamps, large tomentose 

 plants. Can., N. B., Ont., N. W. T. and Alaska, Me., N. 

 H., Mass., Vt., N. Y., N. J., Pa., Va., Mich., Idaho. 



14. M. subglobosum Br. & Sch. (M. pseudopunctatum Hr. & Sch.) 



In bogs and swamps, especially in peat. Cir., Xf., Ont., 

 Me., Mont., Alaska and Yukon Terr. 



15. M. hymenophvlloides Hubn. Rare on cliffs, sterile, dr.. Lab., 



Can., R. M'., Vt., N. Y. 



A NEW SPECIES OF MNIUM FROM IDAHO AND MONTANA. 



BY E. G. BRIXTON .\ND R. S. WILLIAMS. 



Jl/fNlUM NUDUM, n. sp. R. S. Williams. Plants in loose, 

 / ri extensive mats of a dark green color, stems red, naked be- 

 low, arising from a radiculose, horizontal portion seldom more than 

 2-3cni. high; cross-section of stem with three sharp projecting angles 

 and two rounded ones, in each of which is a small leaf-trace, central 

 strand well developed, outer walls of one row of thick-walled red 

 cells; leaves crowded at the apex in the gametoph\te, largest at 

 summit, often 5-8mm. long by 4-5111111. wide, slightly contracted 

 at base, not decurrent, margins entire, not thickened, bordered by 

 one or two rows of pale elongated cells, apex roundefl, retuse or 

 apiculate; ^•ein usually vanishing below the apex, but occasionally 

 confluent with the margin, broad at base gradually tapering, with, 

 a central colored strand; cells slightly elongated transversely, 

 o8o-.io8niiii.; hexagonal, not collenchymatic, inflated. 



Dioicous, male plants often leafless except at apex; seta bright 

 red, 1-2. 5cm. high; capsules ovoid, 4-5niin. long, pendent, becoming 

 horizontal when old; lid apiculate, mouth bordered by several rows 

 of dark cells; annulus large, simple; peristome slightly longer than 

 the endostome, teeth with about 30 rows of outer plates and 35 

 inner lamellae; membrane of endostome solid, not perforate, carinate 

 segments split along the keel in the upper part, cilia three; endo- 

 stome and the upper part of the teeth papillose; spores .02 7-. 0321111" , 

 maturing in early spring. 



Differs from M. subglobosum, to which it has been referred, 

 in its di3icous inflorescence, naked stems and shorter pedicels, 

 larger peristome with more numerous lamellJ^; from J/, punctatum. 

 in the not thickened border of the leaves and the naked stems, not 

 radiculose; and from M. glabrescens also in the not thickened 

 border of the leaf, and stouter, more erect pedicel. 



