66 BRYACEAE 



P. nutans (Schreb.) Lindb. Common in swampy places. 

 Early summer. 



P. proligera (Lindb.) Correns. Roadside bank, N. Y. Bot. 

 Gardens, E. G. B., Bx!; banks of brooks, Richmond and Ross- 

 ville, S. Id!!; Beacon Falls, Hamden, and New Haven, Bry. Ct. 



MNIOBRYUM (Schimper ex parte) Limpr. 



All species dioicous; antheridia in the axils of the perigonial 

 leaves. Leaves serrate at apex, not margined, but marginal 

 cells somewhat narrower than the median; leaf cells as a whole 

 broader than in Bry urn but longer and narrower than in Mnium, 

 thin-walled. Capsules pendent, small and short, pear-shaped ; 

 stomala immersed; annulus lacking; peristome perfect. Plants 

 of wet places, such as springs, ditches, banks of streams and 

 ponds. 



M. albicans (Wahlenb.) Limpr. (Bryum Wahlenbergii Schwaegr.) 

 "On moist rocks and banks, common but rare in fruit," Muse. 

 App. 189; Bronx Park and S. Id., E. G. B., Bx!; Richmond, 

 S. Id.!!; Orient, Latham. 



BRYUM Dill. (Plate VI, Fig. 2.) 



Plants densely tufted, interwoven with radicles, usually with 

 branches arising below the "flowers." Leaves ovate to lanceo- 

 late, thin and very little hygroscopic, rarely obtuse; cells smooth, 

 rather large, rhombic to hexagonal, quadrate to rectangular at 

 base, the marginal often very narrow and forming a more or 

 less distinct, sometimes thickened border; costa usually excur- 

 rent. Capsule on a long seta, usually more or less pendulous, 

 pyriform but varying from subglobose to elongated-clavate, 

 usually symmetrical; operculum conical, usually apiculate but 

 never rostrate; annulus present; peristome of 16 long-lanceolate, 

 closely articulate teeth; the inner of a basal membrane about 

 half the length of the teeth, bearing 16 lanceolate keeled seg- 

 ments alternating with the teeth, and often split along the keel, 

 usually with 1-3 cilia between the segments. When fully de- 

 veloped these cilia are appendiculate, i. e., bear short transverse 

 appendages at the articulations; the cilia are sometimes rudi- 

 mentary and in a few species the inner peristome is adherent 



