270 A MANUAL OF MOSSES 



more abruptly enlarged and hyaline ; costa well developed, 

 orange, up to two-thirds or three-fourths as long as the leaf; 

 perichaetial leaves slenderly acuminate and up to 2.5 mm. long, 

 plicate, erect : seta up to 3 cm. long, castaneous, strong, dex- 

 trorse; capsule yellowish, the urn about 2.7 mm. long, arcuate, 

 oblong-cylindric, contracted below the mouth when dry ; peris- 

 tome-teeth strong, castaneous, strongly trabeculate, hyaline- 

 margined, the dorsal lamellae cross-striolate below, papillose 

 and hyaline above ; segments entire or nearly so, about as 

 long as teeth, the basal membrane about two-fifths as high 

 as teeth ; cilia 2 or 3, usually one, at least, as long as the seg- 

 ments, nodose, hyaline, minutely papillose ; annulus usually 2- 

 seriate ; exothecial cells rounded-quadrate above to rectangu- 

 lar-hexagonal below; spores castaneous, minutely papillose, 

 medium-walled, about .016-.019 mm., mature in spring. 



On rotten logs, roots of trees, wet soil, etc., in wet, shaded 

 places : Europe, Asia, and apparently well distributed through- 

 out temperate North America. The species occurs in Eastern 

 Pennsylvania and has been found once in our region. 



McKean : In springy places near Bradford, May 17, 



1895. D. A. B. (Figured). 



6. Amblystegium kochii Bryologia Europaea. 

 (Plate XXXVIII) 



Stem prostrate with short erect or ascending branches, the 

 branches not usually reaching more than 5 or 6 mm. long, the 

 general color of the loose mats being pale green to deep green : 

 stem- and branch-leaves very similar, spreading rather wide- 

 ly or almost squarrose, erect-spreading when dry, cordate- 

 ovate, narrowed but scarcely decurrent at base, the apex long 

 and slenderly acuminate, the leaves sometimes narrower and 

 more lanceolate but always long-acuminate, usually 1-1.5 mm. 

 ^ong, entire to faintly serrulate, plane-margined ; costa medium 

 strong, yellowish, usually about three-fourths as long as the 

 leaf; median leaf-cells more or less chlorophyllose, thick- 

 walled, rhomboid-hexagonal, the ends blunt or parenchyma- 

 tous, about 4-6:1 or longer, the basal wider, the alar rectangu- 

 lar to rounded-quadrate, quite densely incrassate, hyaline or 

 colored, but scarcely forming distinct alar patches ; perichaetial 

 leaves up to 2 mm. long, lance-linear, long-acuminate : seta 

 about 1.5-2 cm. long, castaneous, flexuous, dextrorse; capsule 

 hypnoid, similar to that of A. serpens, the urn oblong-cylindric, 

 inclined to cernuous, arcuate, about 2-2.5 mm. long, contracted 

 below the mouth when dry ; peristome-teeth brownish or yel- 

 lowish, hyaline and papillose above, cross-striolate below, 

 hyaline-margined, strongly and closely trabeculate, the dorsal 

 lamellae and divisural plain ; segments about as long as the 



