56 A MANUAL OF MOSSES 



April IS, 1906; Keown, November 14, 1909. 

 (Figured). O. E. J.; on clay bank, VVildwood 

 Road, November 19, 1908. * O. E. T. and G. 

 K.J. 



3. Ditrichum pallidum | Schreber] Hampe. 



(.Plate VI.) 



Loosely cespitose, bright green ; stems about 5 mm. high, 

 more or less erect, or with a creeping base ; leaves erect-spread- 

 ing, sometimes somewhat secund, from a lance-ovate base, pro- 

 longed linear-subulate, concave, channeled towards the apex; 

 costa strong, long-excurrent, denticulate towards the apex; 

 basal leaf-cells laxly oblong-hexagonal, thin-walled, hyaline, up 

 to about .015-.017 mm., the median cells gradually much 

 smaller, rectangular, forming but a narrow margin to the costa ; 

 seta erect, yellow, slender, dextrorse and flexuous when dry, 

 about 1-2 cm. long; capsule ovate-oblong, yellowish-red, 

 ascending to horizontal, somewhat unsymmetric, usually some- 

 what strumose at base, about 2 mm. long, when dry and empty 

 sub-arcuate and irregularly silicate ; peristome single, the 16 

 teeth bifid deeply, united at base into a very low basal mem- 

 brane, the prongs cylindric, nodose-articulate, finely papillose, 

 reddish, about 0.5 mm. long; annulus compound, deciduous, 

 bordered by two or three rows of small, rounded, reddish- 

 pellucid cells; spores globose, papillose, about .017 mm., red- 

 dish-pellucid, mature in early summer ; operculum conic-ob- 

 tuse, about 0.6 mm. long; calyptra smooth, cucullate, slenderly 

 straight-rostrate, about 2.5 mm. long, the beak reaching about 

 1.5 mm. beyond the tip of the operculum; antheridial clusters 

 gemmiform in axils of the perichsetial leaves. 



On bare soil, usually in woods. Europe, Asia, northern 

 Africa, and, in North America, from Ontario to the Gulf of 

 Mexico and westward to Kansas. Very common in our region. 



Allegheny : Sandy Creek, May 8, 1904, Powers Run, 



May 10, 1905, Fern Hollow, Pittsburgh, 

 Tune 18, 1907, and Douthett, December 

 29. 1908. O. E. J.; Moon Township, 

 April, 1902. J. A. S. 



Armstrong : AYhiskey Hollow, West Kittanning, Au- 

 gust 26, 1903. J. A. S. 



Beaver : Beaver Falls, May 11, 1907. O. E. J. 



Center : Barrens, near Scotia, July 14, 1909, 



Tussey's Mountain, near Shingletown, 

 July 15, 1909, and Matternville, Septem- 

 ber' 20, 1909. O. E. J. 



Crawford : Linesville. June 11, 1908. O. E. T. 



Fayette : Ohio Pyle. May 30-31, 1909. O*. E. I.; 



