268 A MANUAL OF MOSSES 



than 1.5 cm. long; leaves up to 1 mm. long, broadly cordate- 

 ovate, usually rapidly and uniformly narrowed to an acute or 

 sub-obtuse apex, rounded to a narrow base, slightly concave, 

 slightly decurrent, widely spreading both wet and dry, the 

 margins plane and minutely serrulate ; costa strong, wide at 

 base, yellowish, usually extending up into the apex; leaf-cells 

 sub-incrassate, the median oblong-rhomboidal with rounded 

 ends, about 2-4(-6) :1, the apical similar, the median basal 

 oblong-rectangular, the cells of the angles somewhat wider, 

 varying to short-rectangular or quadrate, incrassate, often 

 opaque or colored: seta about 1-1.5 cm. long, castaneous, 

 dextrorse ; capsule castaneous, oblong-cylindric, arcuate, cernu- 

 ous, constricted below the rim when dry, narrowed at base to 

 distinct neck, the urn about 1.6-1.9 mm. long; peristome typic- 

 ally hypnoid ; spores mature in spring, somewhat incrassate, 

 minutely roughened, about .010-.012 mm. 



On stones, rotten wood, bases of trees, etc., along brooks or 

 in moist situations in woods ; Europe, and from lower Canada to 

 the Gulf of Mexico. By many authors regarded as a variety of 

 A. twin in, but in our region quite common and well marked. 



Allegheny : Power's Run, May 7, 1905, and May 17, 



1907, Fern Hollow, August 26, 1906, and 

 Darlington Hollow, October 25, 1908. 

 O. E..J. 



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



Fayette : Cheat Haven, September 26, 1910. O. E. 



J. and G. K. J. (Figured). 



Greene 



McKean 



Washington 



&' 



VVaynesburg, May 30, 1904. O. E. ^. 

 Bennett Brook, July 15, 1893. D. A*. B. 

 Library P. O., April 22, 1906, Hanlin, May 

 21, 1908. 



\Yestmoreland : Hillside, May 19, 1906, and May 22, 1909, 



and Trafford City, Tune 13, 1908. O. E. J. 



4. Amblystegium juratzkanum Schimper. 



(Plate XXXVII) 



Light yellowish-green, small : steins prostrate, rooting, 

 slender, the branches irregularly disposed, often ascending to 

 erect, and rising to a height of 1-1.5 cm.; leaves when moist 

 irregularly spreading to widely squarrose-spreading, when dry 

 spreading to squarrose-spreading and shriveled, ovate-lanceo- 

 late, gradually acuminate, about 1 to 1.4 mm. long by 0.5 mm. 

 wide but quite variable, almost entire to minutely denticu- 

 late, plane, the base narrowed, decurrent and slightly concave ; 

 costa yellowish, fairly strong, reaching to the middle or some- 

 what further ; median leaf-cells prosenchymatous, linear-hexa- 

 gonal, about 4-8:1. moderately incrassate, hyaline, the apical 



