624 musci. (mosses.) 



&c. ; common : ripens its fruit (which is scarce) in October and NoTember. 

 (Tab. 16.) (Eu.) 



2. L. minus, Hampe. Besides numerous discrepancies, singly of not 

 much importance, this species differs from the last in its much smaller size, its 

 preference for dry localities, and the time (May and June) of ripening its fruit. 



— On the ground, dry woods ; not rare. (Eu.) 



Tribe VI. FISSIDENTE^E. 



17. FISSIDE1VS, Hedw. (Tab. 15.) 



Calyptra cuculliform, or conic-mitriform. Capsule oval or oblong, erect or 

 cernuous, rather long-pedicellate. Operculum conic-rostrate. Peristome single : 

 teeth 16, geniculatc-inflexed : — otherwise as in Dicranum. Inflorescence various. 



— Frond-like plants ; the leaves exactly two-ranked, inserted on opposite sides of 

 the stem, their proper lamina infolded-boa.t-sb.aped, producing from the keel an 

 equitant blade, which forms the principal portion of the leaf; areolation minute, 

 hexagonal-rotund. (Name from the Latin Jissus, split, and dens, a tooth.) 



# Fruit terminal. 



1. F. ItyaBiisus, Hook. & Wils. Stems l"-2" high, erect, simple; 

 leaves oblong-lanceolate, acute, without any costa; areolation large and hya- 

 line ; capsule erect, oval ; calyptra conic, entire at the base. — Damp earth, in 

 shady woods, near Cincinnati, Ohio : found only by the late T. G. Lea. 



2. F. oMusifdlillS, Wils. Stems simple, 2" -3" high; leaves oblong- 

 oval, very obtuse, costate nearly to the apex ; capsule obovate-oval ; operculum 

 convex-conic, with a very short rostrum ; spores large ; calyptra cuculliform : 

 dioecious ; male flower terminal. — Wet and shaded rocks, near rivulets ; Cen- 

 tral and Southern Ohio. 



3. F. exigll&BS, Sulliv. Size, inflorescence, and calyptra as in the last; 

 leaves oblong-lanceolate, costa ceasing near the apex ; capsule oval, somewhat 

 oblique; operculum rather short-rostrate. — Damp rocks in shaded ravines, &c. ; 

 common. 



4. F. miamtulus, Sulliv. Size, inflorescence, and calyptra as in the 

 two preceding species ; leaves linear-lanceolate, with a transparent wavy bor- 

 der ; costa vanishing near the summit ; capsule oval, erect ; operculum rather 

 long-rostrate. — With the last. 



5. F. toa'yolties, Hedw. Somewhat larger than the last three ; capsule 

 and operculum same as in No. 4 ; leaves oblong-lanceolate, with a thickened 

 border; costa excurrent; calyptra cuculliform: monoecious; male flowers nu- 

 merous, axillary. — Moist and shaded banks. (Eu.) 



6. F. Ravcnelii, Sulliv. Size, calyptra, and inflorescence as in No. 2 ; 

 leaves linear-lanceolate, costate to the apex, subpapillose, repand-dentate on the 

 pellucid margins of the true lamina, denticulate on the blade ; areolation minute, 

 opaque; capsule elliptic-oblong, papillose. (Mem. Amer. Acad., n. ser., 4, p. 

 171, t. 2.) — Damp ground, S. Carolina, Ravenel, Curtis. 



7. F. OSmiUldioidOS, Hedw. Stems erect, l'-H' high, branched; 



