OF WESTERN PENNSYLVANIA 335 



from the southern part of Canada to the Gulf States and 

 Colorado. Rather common in our region. 



Allegheny : Thirteen pockets determined from various 



localities', mainly on old logs in ravines. 

 O. E. J. and G. K. J. ; Fern Hollow, Jan- 

 uary 21, 1906. O. E. J. (Figured). 



Clearfield : Phillipsburg. T. P. James. Porter's Cata- 



logue) . 



McKean : Gate's Hollow, Bradford, April 29, 1898. 



D. A. B. Issued as Grout's No. 116, North 

 American Musci Pleurocarpi. 



\\';estmoreland : Near Apollo, 1902. Miss K. R. Holmes ; 

 Greensburg, T. P. James. (Porter's Cata- 

 logue). 



3. Brachythecium oxycladon [Bridel] Jaeger. 

 (B. laetuin Bryologia Europsea; Hypnum oxycladon Bridel). 

 Cespitose, bright or yellowish-green : stems prostrate, 

 branching unequally and irregularly, the branchlets attenuate 

 at the apex and erect ; leaves close, loosely imbricate, ovate in 

 the stem-leaves and more lance-ovate in the branch-leaves, 

 rather abruptly acuminate, concave, plicate, finely serrulate all 

 around ; costa rather narrow, extending about to mid-leaf ; 

 median leaf-cells long, narrow, about 8-10:1, flexuous, the 

 basal more or less quadrate, the alar numerous, small, rather 

 incrassate, the alar portion strongly decurrent : seta about 

 2.5 cm. long, flexuous, flattened and dextrorse when dry; 

 capsule sub-erect, about 4:1, 3-4 mm. long, oblong-cylindric, 

 when dry somewhat arcuate and often inclined; lid conic- 

 acuminate ; annulus none ; peristome parts of about equal 

 length, hypnoid, the cilia somewhat appendiculate, usually 2 

 in number; spores mature in fall. 



On earth, rocks, roots and bases of trees, in woods, but 

 not so frequently occurring on rotten logs as do some of the 

 other species. Not yet discovered in our region. 



4. Brachythecium campestre (Bruch) Bryologia Europsea. 



{Hypnum campestre Bruch). 



(Plate XLIX) 



Very closely resembling B. salebrosum, but differing in 



having the seta smooth at base and slightly rough above. Grout 



notes that the leaves are usually looser and more distant — 



"Mosses," page 278. Otherwise the characters are as given for 



B. salebrosum. 



On moist earth, rocks, or on rotten logs, usually prefer- 

 ring a non-calcareous habitat. Spores mature in winter. Eu- 

 rope, Asia, northern Africa, and, in North America, from 

 Canada to the northern United States and south in the moun- 



