134 American Midland Naturalist Monograph No. 6 



Known from the following counties: Allegheny, Beaver, Crawford, Erie, Fayette, Hun- 

 tingdon, Lycoming, McKean, Somerset, Washington, and Westmoreland. Sp>ecimen fig- 

 ured: Mellon's summer home. Laurel Hill Mts., New Florence, Westmoreland Co., 

 September 8-11, 1907. O.E.J. 



H. Bryum capillare [Linnaeus] Hedwig 



(Mnium capillare Linnaeus) 

 Plate XXIV 



Rather densely cespitose, soft, light green: stems low, in our specimen 

 about 5 mm high, reddish below, radiculose at base, erect, rather stout, some- 

 times branching at base: leaves rather dense, spreading, not forming a very dis- 

 tinct comal tuft, soft, widely obovate-spatulate or rounded with a narrowly 

 oblong base, the apex abruptly acuminate, margins plane; costa rather wide, 

 reddish at base, in the lower leaves and younger plants ending below the apex 

 but in upper leaves of older plants excurrent-acuminate to piliferous; leaf-cells 

 rhomboid-hexagonal, thin-walled, the marginal in one to several rows elongated 

 and narrow, forming a rather indistinct border, the upper marginal projecting to 

 form low denticulations, the basal parenchymatous, rectangular, those near 

 the costa in the middle of the leaf more or less inflated: seta rather long, up to 

 3 cm; capsule rather large (5 mm) with a distinct neck comprising about one- 

 third the length of the capsule, which is subcylindric, usually symmetric, hori- 

 zontal to sub-pendulous, reddish to chestnut-color; operculum conic-apiculate, 

 reddish-orange; peristome large, reddish; typically dioicous: mature in July 

 or August. 



On leaf-mould and loamy soil in woods, often on bases of trees and on 

 ledges, — almost cosmopolitan. 



McKean Co.: Quintuple, July 15, 1896. D.A.B. (figured). Washington Co.: 

 Linn and Simonton. (Porter's Catalogue). 



5. Rhodobryum (Schimper) Hampe 



Dioicous or rarely polyoicous: very robust plants of Mnium-like aspect, 

 gregarious to loosely cespitose: stem ascending from subterranean rhizome-like 

 stolons; lower leaves remote, mostly scale-like and imbricated, comal leaves 

 large, spatulate, bordered, sharply doubly serrate above, forming terminal 

 rosettes; costa broad, narrowing above and disappearing just below apex in 

 most species; leaf-cells rhombic- to elongate-hexagonal, at the base elongnte- 

 rectangular; perichaetial leaves smaller, lanceolate, long-acuminate: seta single 

 or in twos or threes, elongate, brownish, more or less hooked at apex; capsule 

 horizontal to pendent, oblong-cylindric, slightly arcuate, collum short; annulus 

 broad and revoluble or narrow and deciduous in pieces; peristome- teeth con- 

 fluent at their insertion, lanceolate to linear-subulate, yellowish- to reddish- 

 brown, hyaline above, somewhat bordered, and finely papillose; segments free, 

 yellowish, broadly lance-subulate, fenestrate to gaping along the keel; basal 

 membrane high and carinate outwards; cilia filiform, long-appendiculate; spores 

 .014-.024 mm; operculum convex-apiculate. 



A widely distributed genus of about 5C species; 7 species occur in North 

 America, one being in our range. 



