198 A MANUAL OF MOSSES 



Heathlands, dry pastures, thin woods, etc., in hilly and 

 mountainous regions almost the world over. Common in our 

 region. 



Allegheny : A" ear Library P. O., April 29, 1906 O 



E. J. 



Armstrong : On ground in dry pasture, Kittanninp 

 September 24, 1904. O. E. J. (Figured) 



Butler : Slippery Rock, 1906. Miss Susan Gageby 



Cambria: : Near Cresson, May 18, 1904. O. E. J. 



Center : Slope of Bald Eagle Ridge near Mattern 



. September 20, 1909. O. E. J. 



Clearfield : Between Clearfield and Pottersdale, Tulv 



13, 1908. O. E. J. 



Clinton : Near Lock Haven, July 15, 1908. O. E J 



Crawford : Linesville, May 12, 1908. O. E. J. 



Erie : Presque Isle, May 8-9, 1906. 6. E. J. 



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



and G. K. J. ; May 13, 1905. O. E. J. 



McKean : Langmade, April 26, 1896. D. A. B. 



Mercer : Half-moon Swamp, June 12, 1906. O. E. J. 



Potter : Keating Summit, July 21, 1904. O. E. J. 



4. Polytrichum alpestre Hoppe, Schwaegrichen. 

 (Polytrichuin strictum Banks, Menzies). 

 (Plate XXIX) 



Large mosses forming dense tufts up to 20 cm. deep, tufts 

 matted with a dirty-white tomentum : stems branching, rather 

 slender, often matted tomentose to within 2-3 cm. of the apex; 

 leaves more or less rigidly appressed-imbricate when dry, 

 when moist with the lance-linear limb spreading and 4—5 mm. 

 long, from an oblong sheathing base about 1.5 mm. long, 

 margin of limb entire, inflexed, the apex rather abruptly nar- 

 rowed into a linear, reddish-pellucid, slightly serrate acumen, 

 leaves dorsally serrulate nearly to the sheathing base,' the costa 

 bearing ventrally about 25-35 lamellae ; lamellae 5-8 cells high, 

 the terminal cell broader and abruptly narrowing to an obtuse 

 short acumen, as seen in cross-section ; areolation of sheathing 

 base almost hyaline, not so markedly incrassate, the median 

 basal rectangular, 4—8 times as long as broad, towards the 

 margin and upwards in the sheathing portion narrower, longer, 

 either prosenchymatous or parenchymatous, cells of infiexed 

 margin of limb obliquely quadrate or rectangular to linear-ob- 

 long in the border, incrassate; perigonial leaves of male plant 

 obovate-orbicular, the costa broad, lamellate on the upper half, 

 percurrent in a broadly acute acumen : seta erect, slender, 

 wiry, sinistrorsly flexuous, 4—8 cm. long, lustrous, rich chest- 

 nut-brown below and lighter above ; capsule more or less cubic, 

 2-3 mm. long, acutely angled, papillose, yellowish to chestnut- 



