80 A MANUAL OF MOSSES 



j. Leaves more or less rounded at apex: seta lateral in basal 

 half of stem: leaf-cells about .008 — .011 mm. 



10. F. subbasilaris. 



1. Fissidens hyalinus Hooker and Wilson. 

 Gregarious, pale green, minute, 2-4 mm. high : stem 



usually simple, erect ; leaves in 3-5 pairs, soft, the upper much 

 larger, lance-oblong, acute, non-costate, margined by a single 

 row of narrow elongate cells, the sheath hardly reaching the 

 middle of the leaf, margin entire; cells large, about .030-045 X 

 .060-100 mm., thin-walled, elongate-hexagonal, hyaline : seta 

 terminal, 1-2 mm. long, erect smooth; capsule oblong, erect, 

 thin- walled; teeth closely articulate, red, cleft to the middle; 

 operculum rostrate ; calyptra cylindric-conic and covering the 

 rostrum only of the operculum; spores .014-.020 mm. 



The original station of this rare moss was "Moist, rocky 

 ledges. Bank Lick, on Cassidy's farm, near Cincinnati, Ohio," 

 where it was first collected by T. G. Lea, in 1839. This sta- 

 tion has since been lost, but the moss has been found elsewhere 

 in Ohio : on ground in deep ravines near Painesville, — H. C. 

 Eeardslee, and later in Pennsylvania, as follows : 



Washington : On clay banks with Fissidens taxifolins in 

 ravines near Washington, September and Oc- 

 tober, 1892, 1894, and 1898. Linn and Simon- 

 ton. 



2. Fissidens bryoides [Linnaeus] Hedwig. 



(Hypnuin bryoides Linnaaus). 

 (Plate X) 

 In loose tufts or densely gregarious, rather dark green : 

 stems ascending or erect, 5-15 mm. high; leaves numerous, 

 ascending, or the apical erect, oblong-lingulate, usually abrupt- 

 ly and somewhat obliquely acuminate, the sheath reaching 

 about half way to the apex, the dorsal lamina gradually be- 

 coming very narrow at base, the border strong and reaching 

 the apex, where it becomes confluent with the costa, margin 

 entire or sometimes faintly denticulate at apex; costa strong; 

 leaf-cells rounded-hexagonal, somewhat incrassate, somewhat 

 smaller at the apex of the sheath, becoming rectangular at the 

 base, the border consisting of two or three rows of linear- 

 prosenchymatous incrassate cells : seta erect, flexuous, about 

 4-9 mm. long, yellowish to reddish, smooth, slender, terminal : 

 capsule erect or arcuate, usually reddish-yellow, smooth, 

 oblong-oval, about 7-8 mm. long; peristome-teeth red, the 

 upper two-thirds split into two awl-like prongs with spiral 

 thickenings, pellucid, papillose, the teeth inserted below the 

 mouth ; spores smooth, small, about .010-012 mm. in di- 

 ameter; operculum conic-rostrate. Mature in late fall. 

 Antheridial flowers gemmiform, axillary. 



