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. snbbasilaris. 



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-.045X 

 .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. 

 Keardslee, and later in Pennsylvania, as follows : 



Washington : On clay banks with Fissidens ta.vifoliiis in 

 ravines near Washington, September and Oc- 

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

 ton. 



2. Fissidens bryoides [Linnaeus] Hedwig. 



(Hypnnm bryoides Linnaeus). 



(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. 



