OF WESTERN PENNSYLVANIA 189 



Fayette : September 10, 1905. O. E. J. and G. E, 



K.; September 1-3, 1907. O. E. J. and 

 G. K. J. 



Washington : Charleroi, October 14, 1905. O. E. T. and 



G. K. J. 



Westmorland: New Florence, September 8-11, 1907, and 



"Shades," east of Blackburn, Tune 13, 

 1908. O. E. J. 



2. Catharinaea angustata [Bridel] Bridel. 



(Polytrichum angnstatnm Schwaegrichen ; Atrichum angnstatnm 

 Bryologia Europaea). 



(Plate XXVII) 



Loosely cespitose : stems erect, about 1-3 cm. high, or 

 more ; lower leaves minute, the size of leaves increasing up- 

 wards, dull green, much crisped when dry, lance-linear, doubly 

 serrate from about the middle upwards along the margin and 

 dorsally towards the apex ; costa with about 5-8 ventral 

 lamellae above, the costa and lamellae together occupying about 

 one-fourth to one-half of the width of the leaf ; lamellae 6-8 

 cells high, cells equal in size; basal leaf-cells elongate-rectan- 

 gular, rather incrassate, about .010-.025 mm. in diameter, above 

 becoming quadrate, towards the apex slightly smaller, more 

 or less hexagonal with the longer diameter transverse, about 

 .010-.015 mm.: seta erect, about 1.5-3.5 cm. long, smooth, lus- 

 trous, castaneous, somewhat sinistrorse ; capsule lustrous, 

 castaneous, linear-cylindric, usually slightly curved, about 

 5-8X1 mm.; peristome-teeth obtuse, about 2.5 mm. long; 

 calyptra cucullate. slenderly rostrate, about 4-7 mm. long ; 

 operculum hemispheric, slenderly rostrate, about 2.5 mm. long 

 and more or less abruptly divaricately bent ; spores about 

 .012-.018 mm., pale, orange-pellucid, smooth to minutely 

 roughened, somewhat incrassate, mature in late fall and win- 

 ter. 



Occurring on wooded shaly or clayey banks ; Europe, Asia, 

 and, in North America, from Newfoundland and Ontario to 

 the Gulf States. In our region not very common, seemingly 

 preferring steep slopes of ravines, and there often under 

 hemlocks. Quite variable and often approaching closely the 

 two species next following. 



Allegheny : Powers Run, November 30, 1908, and 



Darlington Hollow, October 25, 1908. 

 O. E. J. 



Armstrong : Kittanning, October 21, 1905. O. E. J. 



Crawford : Hartstown, May 29-31, 1909. O. E. J. 



and G. K. J. (Figured). 



