MUSCI. (MOSSES.) 15 
4. P. coh#rens, Hedw: Leaves oblong-lanceolate, strongly serrate ; 
costa vanishing below the apex ; capsule brownish-purple. — River-banks, Cour 
tral Ohio. (Eu.) 
* % Plants without a confervoid thallus. Columella persistent. 
§ 2. PHYSCOMITRELLA, Schimp.— Caulescent : leaves sip areolated : 
calyptra campanulate-conic : capsule globose, apiculate: antheridia , axillary, 
with paraphyses oo distended at the apex. (Closely allied to (ane 
ma among Funariex.) 
5. P. piatems, Hedw. Leaves subspatulate-lanceolate, serrate, costate 
nearly to the apex; capsule sometimes exserted. — Moist clayey soil, Central 
Ohio: rare. (Eu.) 
§3. ACAULON, Mull. — Stemiless, bulb-like: leaves broad-ovate or obovate, very 
concave, recurved at the apex, with a lax areolation: capsule globose, entirely con- 
cealed by the 2 or 3 larye subcucullate perichetial leaves: calyptra minute, cam 
Auch inflorescence as in § 1. 
triquétrum, Spruce. Leaves 3-ranked, carinate-concave, shortly 
Satis by the continuous excurrent costa, the perichetial ones 3 and larger ; 
capsule horizontal, with a curved pedicel. — On dry soil; rare. (Eu.) 
7. P. miiticum, Schreb. Size of the last; leaves not carinate, costate, 
the perichzxtial ones 2; capsule erect; pedicel straight.— Moist ground. (Eu.) 
8. P. Schimperianum, Sulliy. (Muse. Bor.-Amer., No. 26.) . Re- 
sembles the last two species, but the perichzetial leaves near the apex are papil- 
lose on both surfaces, erose-dentate on the recurved margins, and cuspidate by 
the costa which extends scarcely 4 of the way towards their base, the other leaves 
without any trace of a costa; capsule, pedicel, and calyptra as in No. 7.— 
Marcos, Texas, Wright. 
§ 4. PHASCUM Proper. — Stems simple, or once or twice divided as innovations : 
ves costate ; areolation below large, loese, oblong, above minute, subquadrate, 
chlorophyllose: calyptra cuculliform: capsule globular, acuminate. a+ {Stina 
the Pottiezx.) 
9. P. cuspidatum, 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 peri 
leaves. — Old fields; not uncommon. (Tab. 15.) (Eu.) 
65. PLEUR{DIUM, Brid. — Stems erect or decumbent: leaves subulate, costate, 
with a loose and oblong hexagonal reticulation: calyptra cuculliform or campanulate- 
conic: capsule globular or ovate, sometimes becoming lateral by innovations of the 
stem. 
10. P. alternifolium, Brid. Lower leaves ho anon the upper 
much longer, subulate from an oblong base; costa excurrent, with the pnint 
more or less serrulate; capsule ovate, obtusely acuminate; calyptra cli ; 
male flower gemmiform, axillary. — Old fields, &c.; common. —In 
forms the base of the leaves is usually more Giiiky sovdlnted tana aii 
G. M. 2 
. 
