MUSC1. (mosses.) G15 



4. P. cohcferesis, Hedw. Leaves oblong-lanceolate, strongly serrate; 

 costa vanishing below the apex ; capsule brownish-purple. — River-banks, Cen- 

 tral Ohio. (Eu.) 



# # Plants without a confervoid thallus. Columella persistent. 



§ 2. PHYSCOMITRELLA, Schimp. — Caulescent : leaves loosely areola ted : 

 calyptra campanulate-conic : capsule globose, apiculate : antheridia naked, axillary, 

 with puraphyses globosely distended at the apex. (Closely allied to Aphanorheg- 

 ma among Funarieae.) 



5. P. piatens, Hedw. Leaves subspatulate-lanceolate, serrate, costate 

 nearly to the apex; capsule sometimes asserted. — Moist clayey soil, Central 

 Ohio : rare. (Eu.) 



§3. ACAULON, Mull. — Stemless, bulb-like: leaves broad-ovate or obovate,very 

 concave, recurved at the apex, ivith a lax areolation : capsule globose, entirely con- 

 cealed by the 2 or 3 large subcucullate perichcetial leaves: calyptra minute, cam- 

 panulate: inflorescence as in § 1. 



6. P. triquetl'Una, Spruce. Leaves 3-ranked, carinate-concave, shortly 

 cuspidate by the continuous excurrent costa, the perichaetial ones 3 and larger ; 

 capsule horizontal, with a curved pedicel. — On dry soil ; rare. (Eu.) 



7. P. BiaulicUMl, Schreb. Size of the last; leaves not carinate, costate, 

 the perichaetial ones 2 : capsule erect ; pedicel straight. — .Moist ground. (Eu.) 



8. P. SchisuperiaiaaiBta, Sulliv. (Muse. Bor.-Amer., No. 26.) Re- 

 sembles the last two species, but the perichaetial leaves near the apex are papil- 

 lose on both surfaces, erose-dentate on the recurved margins, and cuspidate by 

 the costa which extends scarcely \ of the way towards their base, the other leaves 

 without any trace of a costa; capsule, pedicel, and calyptra as in No. 7. — San 

 Marcos, Texas, Wright. 



§ 4. PHASCUM Proper. — Stems simple, or once or twice divided by innovations : 

 leaves costate; areolation below large, loose, oblong, above minute, subquadrate, 

 chlorophyllose : calyptra cuculUform: capsule globular, acuminate. — (Resembles 

 the Pottieae.) 



9. P. Clispidilluin, Schreb. Leaves elongated-lanceolate, cuspidate, 

 more or less papillose on the back near the apex; costa excurrent; capsule 

 immersed or exserted ; antheridia mostly naked in the axils of the perichaetial 

 leaves, — Old fields ; not uncommon. (Tab. 15.) (Eu.) 



§5. PLEURtDIUM, Brid. — Stems erect or decumbent: leaves subulate, costate, 

 with a loose and oblong hexagonal reticulation : calyptia cuculUform or campanulate- 

 conic: capsule globular or ovate, sometimes becoming lateral by innovations of the 

 stem. 



10. P. alternifolium, Brid. Lower leaves ovate-lanceolate, the upper 

 much longer, subulate from an oblong base ; costa excurrent, with the point 

 more or less serrulate ; capsule ovate, obtusely acuminate ; calyptra cuculUform ; 

 male flower gemmiform, axillary. — Old fields, &c; common. — In-American 

 forms the base of the leaves is usually more closely areolated than in the Eu- 



