MTJSCI 



411 



1. A. iiiHluliitillil , Beauv. [ Wavy] : Monoicous ; steins about 

 2 inches high, erect, mostly simple ; leaves long, ligulate-lance- 

 olate, undulate, spinulose-toothed, narrowly margined, the nerve 

 with 2 to 4 narrow lamellae ; capsule about J of an inch long ; 

 pedicel 1 to 1| inches in length. Moist grounds. 



2. A. angustatum, Beauv. {Narrowed] : Dioicous; stems 

 shorter and more slender than the preceding ; leaves narrower, not 

 denticulate below the middle, the nerve with more and broader 

 lamellae ; pedicel an inch to near an inch long. Shady woods ; 

 along fences, &c. 



549. POGOIVA^TUIH , Beauv. Hair-cap Moss. 



[Gr. Pogon, beard ; in allusion to the hairy calyptra.] 



Calyptra cuculliform, densely hairy. Capsule cylindrical. Peri- 

 stome single, of 32 teeth, adherent by their summits to the mem- 

 branous-dilated apex of the columella. Lid beaked. Dioicous. Sterile 

 fl. cup-shaped. 



1. P. brcvicaikle, Brid. [Short-stemmed'] : Stems about 1 

 line long; leaves few, crowded and appressed, subulate from a 

 membranaceous base, denticulate ; lid with a short oblique beak ; 

 capsule smooth; pedicel about an inch long; calyptra apparently a 

 dense web of hoary hairs. Moist clayey banks: "the ground 

 around is always covered by a green stratum of confervoid fila- 

 ments." 



550. POLYTRICHUM, L. Hair-Moss. 



[Gr. Polys, many, and Thrix, hair; the calyptra consisting chiefly of hairs.] 

 Calyptra cuculliform, densely hairy. Capsule 4- or 6-sided, with a 

 discoid apophysis. Peristome single, of 64 teeth, adherent by their 

 summits to the membranous-dilated apex of the columella; other- 

 wise as in Pogonatum. 



1. P. font lit line, L. [Common] : Stems simple, nearly erect, 

 1 to 2 inches high ; leaves spreading or recurved, linear-lanceolate, 

 serrate on the margins and back; capsule oblong, 4-sided, the 

 angles acute ; lid short-beaked from a convex base ; pedicels 2 to 3 

 inches long. Shady moist places. 



2. P. fbrillosimi, Hedw. [Handsome']: Nearly allied to the 

 preceding; capsule longer and slightly curved, with the angles 

 obtuse ; apophysis smaller and tapering into the pedicel ; lid conical. 

 Woods, at the base of trees. 



3. P. juniperiniim, Hedw. [Juniper-like'] : Stem 1 to 2 

 inches high, simple, or divided ; leaves lance-linear, awn-pointed, 

 the margins involute, entire ; capsule and lid as in No. 1 ; pedicel 

 about 1 inches long. On high ground. 



TRIBE 13. BUXBAUMIA^CEAE. 



551. DIPHYS'CIUM, Web. $ Mohr. 



[Gr. dis, twice, and Physke, a bladder; from the two membranes of the capsule.] 

 Calyptra conic-mitriform. Capsule immersed, ovoid-ventricose, ob- 

 lique at base. Peristome double ; the exterior of 16 minute crena- 



