20 MUSCI. (MOSSES.) 
i. D. longiroéstre, Br. & Sch. Stem 1’-3/ high, with innovations from 
near the apex; leaves fragile, more or less falcate-secund, subulaie-sctaccous 
from a dilated base ; costa broad, occupying all the upper portion of the leaf. — 
On rocks, Alleghany Mountains. (Tab. 15.) (Eu.) 
13. TREMATODON, Bich. 
Calyptra cuculliform, inflated. Operculum subulate-rostrate. Capsule oval- 
oblong, inclined, with a very long collum, annulate, tin (ictal Peristome 
single: teeth 16, Ete lanctolate, Sebab nai or more or nee cloyen. Inflores- 
cence dicecious: male flower gemmiform d, gregarious plants, 
with long subulate-setaceous and slice ge costate ee es. (Name from 
Tpipa, a perforation, and édov, a tooth. ) (Tab. 15.) 
- TV. longicéllis, Rich. Capsule with a narrow linear eollum of twice 
its length ; pedicel 14’-2/ long, slender, flexuous, straw-colored. — Clayey and 
sandy soil, New England to Florida, and Ohio, Cassels. (Tab. 15.) 
14. DICRANUM, Hedw. (Tab. 16.) 
Calyptra cuculliform. Operculum conic, long-subulate-rostrate. Capsule 
oval, oblong or cylindrical, regular or somewhat gibbons , erect or cernuous, 
ond beans Peristome single: teeth 16, linear-anceolate, cloyen half -way 
secund, with a a minute, eC es roundis. eolation above. (Name from 
Sixpavos, forked, alluding to the 
§ 1. CYNODONTIUM, Br. & Sch.— Leaves more or less ss papillose, crenulate-ser- 
rate at the apex ; the areolation essen = base: calyptra inflated-cucull form : 
. D. graciléscens, Web. & Mohr., var. tenellum, Bryol. Europ. 
one short, 4/’—10” high; leaves linear- issreolate: searcely papillose, the mar 
gins above plane, the costa vanishing at the apex ; capsule exannulate, oval, not 
strumose, obsoletely striate. White Mts., New Hampshire, Oakes. u.) 
2. D. polycarpum, Ehrh. Stems 1/-9/ high; leaves linear-lanceo- 
late, variously curved, somewhat papillose on both surfaces, denticulate at the 
mose, ribbed when dry ; annulus conspicuous. — Northern shore of Lake 
) 
3. D. virens, Hedw., var. Wahlenbersgii, Bryol. Europ. More ro- 
bust than the last; stems often 3/ high; leaves spreading, flexuons, lanceolate 
subulate, smooth, denticulate at the apex, the costa nearly excurrent ; capsule 
oblong, wise cernuous, prominently strumose, annulate. — Lake Superior 
Agassiz, 
