OF WESTERN PENNSYLVANIA 



163 



Library, April 29, 1906, Power's Run, 

 May 18, 1907, and April 16, 1910, Brush 

 Creek, April 26, 1908, Montrose, Sep- 

 tember 21, 1905. O. E. J. 



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



Butler : W'infield Junction, June 7, 1902. J. A. 



S.; Crider's Corners, April 26, 1908. O. 

 E.J. 



Crawford : Pymatuning Swamp, Linesville, May 18, 



1905, June 12, 1905, and May 12, 1908. 

 O. E. J.; Near Mud Lake, Hartstown, 

 May 29-31, 1909. O. E. J. and G. K. J. 



Erie : Presque Isle, on leaf mould in oak woods. 



May 8-9, 1906. O. E. J. 

 Fayette : Ohio Pyle, May 12, 1905, May 30, 1908, 



(Figured), and June 13, 1908. O. E. 



J. ; Cheat Haven, September 3-6, 1910. O. 



E. J. and G. K. J. 

 Huntingdon : Birmingham, May 17, 1904. O. E. J. 

 Lawrence : Slippery Rock Creek, above Wurtemberg, 



October 16, 1910. O. E. J. and G. K. 



J. ; Slippery Rock, 1906. Miss Susan 



Gageby. 

 Mercer : Houston Junction, July 12, 1902. J. A. S. 



McKean : Bennett Brook, April 7, 1893, and May 8, 



1897, West Branch, April 7, 1893, Ouin- 



tuple, June 15, 1896. D. A. B. 

 Somerset : Ursina, May 12, 1895. O. E. J. 



Washington : Three miles south of Library, April 22, 



1906, North Branch Maple Creek, Char- 

 leroi, April 24, 1908, Hanlin, May 21, 

 1908. O. E. J. 



7. Mnium medium Bryologia Europsea. 



(Astrophylluin medium Lindberg). 



(Plate XXI) 



W'idely and rather loosely cespitose, large, light to dark 

 green : stems erect, up to 5 cm. in our specimens, branching 

 at the base, densely covered with a brown felted tomentum, 

 sterile shoots long and prostrate or ascending; leaves distant, 

 little shriveled when dry, ovate to oblong, somewhat narrowed 

 and slightly decurrent at base, rather obtuse at apex, cuspi- 

 date, narrowly margined all around, sharply serrate from near 

 the base with mainly one-celled teeth, the comal leaves rosu- 

 late, and up to 5X15 mm.; costa reddish, strong, excurrent 

 cuspidate ; leaf-cells large, rounded above to elliptic-hexagonal 

 towards base, the margin consisting of about two rows of 



