OF WESTERN PENNSYLVANIA 299 



leaves with reflexed-squarrose acuminations : seta more or less 

 elongate, red; capsule inclined to horizontal, thickly ovate or 

 oblong-oval, somewhat dorsally gibbous, with neck short and 

 narrowed into the seta, drying mostly smooth and scarcely con- 

 stricted below the mouth, annulate ; peristome normally 

 hypnoid; lid convex with a conic-acute point or shortly and 

 obliquely rostrate. 



A genus of 6 species, mainly mosses of forests in tem- 

 perate and cold regions ; 6 species occurring in North America ; 

 3 species in our region. 



Key to the Species. 



a. Leaves at base semi-amplexicaul, with very large and rounded 



auricles. 3. H. brevirostre. 



a. Leaves with broad insertion but not with rounded auricles. 



b. 

 b. Stem closely 2-3 pinnate; leaves obscurely bi-costate. 



1. H. splendens. 



b. Stem irregularly or distantly 1-2 pinnate; costa double and 

 reaching to about mid-leaf. 2. H. umbratum. 



1. Hylocomium splendens (Hedwig) Bryologia Europsea. 

 (Hypnum splendens Hedwig; Hylocomium proliferum Lindberg). 



(Plate XLIII) 



Widely cespitose in loose mats, lustrous, yellowish to 

 brownish or olive-green : stems long, trailing, red, with green, 

 branched paraphyllia, stems sometimes up to 15 or 20 cm. 

 long, divided, the fern-like shoot of each year ascending from 

 the side of the upper third of the preceding year's shoot, the 

 divisions usually complanately and loosely bi- to tri-pinnate ; 

 stem-leaves crowded, erect-spreading to loosely imbricate, 

 broadly ovate to ovate-oblong, 2-3 mm. long, the insertion 

 wide, the upper portion of the leaf abruptly acuminate into a 

 slender, transversely undulate and flexuous point, or sometimes 

 shorter and obtuse, the leaves basally plicate, sub-decurrent, 

 somewhat concave, recurved at margin below, denticulate and 

 dorsally spinulosely papillose above ; branch-leaves usually 

 acute, smaller and non-plicate, concave, elliptic-oblong; costa 

 double and reaching to one-fourth or one-third the length of 

 the leaf, but faint; median leaf-cells linear-flexuous, about 

 8-10:1, the lower more or less porose, the basal orange-pellucid, 

 incrassate and larger, but not forming distinct auricular 

 groups ; perichaetial bracts long, the inner erect, narrowly 

 acuminate and sheathing: seta about 1.5-2.0 cm. long, red, 

 usually stiff, curved, when dry wrinkled and sometimes sinis- 

 trorse ; capsule oblong-ovate, orange-brown, somewhat turgid, 

 usually horizontally inclined, the urn about 2 mm. long ; peris- 

 tome hypnoid, the teeth basally confluent, trabeculate, lamel- 

 late, dorsally striolate below, papillose above, brownish ; seg- 



