OF WESTERN PENNSYLVANIA 331 



elliptic-oblong, abruptly long-acuminate, more or less serrate 

 above, about 0.9-1.2 mm. long, concave, non-plicate, not papil- 

 lose; costa usually reaching about to the middle of the leaf; 

 median leaf-cells, about 8-10:1, fusiform-elliptic, towards the 

 apex somewhat shorter, the alar quadrate, numerous and 

 forming a group which extends upwards along the margin to 

 often one-third the length of the leaf; inner perichsetial leaves 

 sheathing, long-acuminate : seta rough, about 6-9 mm. long, 

 slender; capsule about 2^.5:1, sub-erect, slightly incurved, 

 dorsally somewhat gibbous, slightly constricted below the 

 mouth when dry; peristome-teeth confluent at base, dark red, 

 with a broad pellucid central stripe marked by a delicate medial 

 line, the segments adhering to and lining the teeth inside, form- 

 ing a hyaline border ; spores mature in autumn. 



On bark of trees and on fallen trunks in woods; in the 

 eastern United States from New England to North Carolina. 

 Rare in our region. 



Elk : McMinn. (Porter's Catalogue). 



2. CAMPTOTHBCIUM Bryologia Europsea. 



Dioicous and pseudautoicous : slender to robust, widely 

 cespitose, mostly yellowish-green, drying stiff, mostly lustrous : 

 stem elongate, procumbent to ascending to erect, thickly- 

 leaved, sometimes stoloniferous, more or less regularly 

 pinnate; leaves erect-spreading, sometimes weakly secund, 

 non-decurrent or but scarcely decurrent, slightly concave, 

 strongly plicate, lance-oval, subulate-acuminate, serrulate all 

 around ; costa simple, ending near or in the apex ; median leaf- 

 cells prosenchymatous, vermicular, thin, smooth, or with 

 , weakly projecting upper angles, the basal lax, yellow, porose, 

 the alar numerous, quadrate; perichsetium not rooting, inner 

 perichaetial leaves much elongate and abruptly subulate : seta 

 moderately long, castaneous, mostly rough, drying twisted; 

 capsule cernuous to horizontal, dorsally gibbous, oblong to ob- 

 long-cylindric, more or less curved ; annulus present ; peris- 

 tome-teeth basally confluent, linear-subulate, bordered, dorsal- 

 ly cross-striate, thickly lamellate; inner peristome of same 

 length, free, the segments broad and carinately split, cilia 

 strong and nodose ; lid conic-acute to thickly rostrate ; calyptra 

 glabrous. 



A genus of about 15 species, confined mainly to tem- 

 perate regions on soil, bark of trees in woods, or in swamps; 

 a number of species occur in the West, but in our region only 

 the following: 



1. Camptothecium nitens [Schreber] Schimper. 

 (Hypnum nitens Schreber). 



A striking species by reason of its bright yellow or golden 

 color, silky lustre, strongly plicate leaves, and stems densely 



