70 A MANUAL OF MOSSES 



4. Dicranum flagellare HedwiLi'. 

 (Plate VIII) 



Rather densely cespitose, bright green above, brownish 

 below, tufts about 1 cm. high : stems radiculose, often with 

 flagellse in the axils of the upper leaves, erect ; leaves crisped 

 and sub-secund when dry, falcate-secund when moist, from an 

 oblong base narrowed gradually into a subulate acumen, 

 strongly involute to near the apex, apex serrate ; costa strong, 

 about one-fourth to one-third the width of the leaf-base, per- 

 current, serrate dorsally at the apex; alar leaf-cells large, dis- 

 tinct, inflated-quadrate, rather thin-walled, colored, reaching 

 nearly to the costa, the leaf-cells above loosely elongate- 

 rectangular, farther above becoming shorter, above the middle 

 rounded-quadrate, incrassate; perichsetial leaves shorter, 

 abruptly subulate-acuminate from a sheathing base : seta erect, 

 sinistrorse when dry; reddish to yellow-brown, about 2 cm. 

 long ; capsule erect, cylindric, symmetric, reddish-brown, about 

 2.5 mm. long, when dry striate and often slightly curved ; lid 

 obliquely long-rostrate, lustrous, brown ; peristome-teeth 

 trabeculate, articulate, confluent at base, cleft to two-thirds to 

 three-fourths, the lower two-thirds reddish and more or less 

 vertically striate-papillose, hyaline above ; annulus delicate ; 

 exothecial cells elongate, strongly laterally incrassate with 

 thinner end-walls, several series at the rim much smaller and 

 rounded-quadrate ; calyptra. reaching to the middle of the 

 capsule, fugacious ; spores globose, slightly roughened, yellow- 

 incrassate, .018-.022 mm. in diameter, mature in summer. 



On decayed logs and stumps and on bases of trees in 

 moist woods. In Europe, Asia, and, in North America, from 

 Nova Scotia to British Columbia and south to Mexico. Rather 

 common in our region. 



Blair : Porter. (Porter's Catalogue). 



Cambria : Fliaton, July 23, 1908. O. E. J. 



Erie : Presque Isle, August 26, 1905. O. E. J. 



Favette : Ohio Pyle, September 1-3, 1906. O. E. J. 



and G. K. J. ; also September 10, 1905. O. 

 E. J. and G. E. K. 



Huntingdon : Porter. (Porter's Catalogue). 



McKean : ^Vest Branch, February 27, 1896. D. A. B. 



Somerset : Allegheny Mts., August 17, 1875. John 



D. Shafer. 



Westmoreland : Mellon's estate. New Florence, Septem- 

 ber 8-10, 1907. O. E. J. (Figured). 



