OF WESTERN PENNSYLVANIA 



267 



A. serpens, the teeth basally confluent, dorsally cross-striolate 

 below, hyaline-papillose above, strongly and closely trabecu- 

 late ; the segments about as long, slightly carinately cleft, the 

 basal membrane about two-fifths as high, the cilia 1 or 2, 

 nodose to shortly appendiculate ; lid conic-acute ; spores about 

 .012-.018 mm., slightly papillose, medium-walled, mature in late 

 spring: autoicous. 



On bases of trees, soil, rocks, rotting wood, etc., in moist 

 woods ; Europe, and, in North America, from Canada to the 

 Gulf of Mexico. Very common in our region. 



Allegheny : Wildwood Road Hollow, November 19, 



1908. O. E. J. and G. K. J.; on rocks, 

 Power's Run, May 10, 1905; Wildwood 

 Road Hollow, June 6, 1908; Fern Hollow, 

 Pittsburgh, June 18, 1907, and Guyasuta 

 Hollow, November 9, 1908. O. E. J. ; 

 Kenny\vood, May 3, 1902, and Moon 

 Township May 18, 1902. J. A. S. 

 Beaver Falls, May 14, 1907. O. E. J. 

 On base of Cratacgus punctata, Crider's 

 Corners, December 29, 1908. O. E. J. 

 Linesville, June 11-12, 1907, and May 12, 

 1908. O. E. J. 



Presque Isle, June 8-9, 1906. O. E. J. 

 Four miles south of Ohio Pyle, September 

 1-3, 1906. O. E. J. and G. K. J, and Sep- 

 tember 1-3, 1907; Ohio Pyle, May 30-31, 

 and July 4, 1908. O. E. J. 

 On log, New Castle. Miss Susan Gageby, 

 1906. ' 



Ursina, May 12, 1905. O. E. J. 

 Hanlin, on wet log. May 21, 1908. 

 O. E. J. 



Laurelville, May 30-31, 1903. J. A. S. ; 

 "Shades," near Blackburn, June 13, 1908, 

 Hillside, May 22, 1909, and Garrett Farm, 

 near Trafford, August 21, 1910. O. E. J. ; 

 slope of Chestnut Ridge above Hillside, 

 September 16-17, 1909. O. E. J. and G. 

 K. J. (Figured). 



3. Amblystegium orthocladon (Beauvois) Jaeger. 



(Hypmim orthocladon Beauvois; A. varium var. orthocladon 

 Husnot). 



(Plate XXXVII) 



Rather dark-green, sometimes olive-green, rather stiff 

 when dry, compactly tufted : stems irregularly branching, the 

 branches of plants in the denser tufts often erect, usually less 



Beaver 

 Butler 



Crawford 



Erie 

 Fayette 



Lawrence 



Somerset 

 Washington 



Westmoreland 



