OF WESTERN PENNSYLVANIA 209 



On sticks and the bases of bushes in and around the edges 

 of slow streams and ponds; Europe and from New Brunswick 

 and Ontario southward to Pennsylvania. Xot yet recorded 

 as occurring within our region. 



2. Dichelyma pallescens Bryologia Europaea. 

 (Fontinalis capillacea Hooker). 



(Plate XXXI) 



Slender, light yello\vish-green, sometimes glossy : stems 

 usually about 5-10 cm. long, the branching sub-distichous ; 

 leaves secund, more or less falcate, the ends of the branches 

 and stems appearing hooked, leaves oblong-lanceolate, about 

 3-5 mm. long, gradually long-acuminate, complicate-carinate, 

 nearly entire ; or denticulate above, plane-margined, acute to 

 obtuse; costa percurrent or nearly so; median leaf-cells rhom- 

 boid-linear, prosenchymatous, about 8-15:1, rather incrassate, 

 the basal colored and somewhat shorter, a few alar wider and 

 oblong, incrassate, the apical shorter ; perichsetial leaves about 

 as long or usually longer than the seta and capsule together : 

 seta about 4 mm. long, slender, enclosed in the perichsetium ; 

 capsule small, thin, ovate, yellowish, about 1 mm. long, trun- 

 cate by the falling away of the lid; lid high-conic; peristome- 

 teeth linear, rather rudimentary, pale, castaneous-pellucid, 

 with distinct divisural and lamellae, and about 10-12 castaneous- 

 pellucid, low ventral trabecuke; segments filiform, longer than 

 teeth, united only at the summit or entirely free, sometimes 

 remaining on the ripe capsule only as short, filiform, cilia- 

 like structures between the teeth ; exothecial cells rounded, 

 castaneous-pellucid, incrassate-collenchymatous, the upper 

 laterally oblong and smaller ; spores mature in summer, cas- 

 taneous-pellucid, incrassate, minutely papillose, varying from 

 about .016-.025 mm. 



On sticks and the bases of bushes along creeks and around 

 ponds; New Brunswick to Minnesota and Pennsylvania. Xot 

 yet found in our region, excepting along the northern border. 



McKean : Bradford. D. A. B. (Porter's Catalogue) ; 



Riverside, New York, a few miles north of 

 Bradford. D. A. B. October 18, 1897. 

 (Figured). 



Family XXV. CLIMACEAE. 



Dioicous ; flowers on secondary stems and at base of 

 branches ; gregarious, large and stately, growing in swamps : 

 stems rhizome-like, subterranean, radiculose, with smooth, 

 branched, reddish-brown rhizoids, secondary shoots 3- to sev- 

 eral-angled, erect, with tree-like branching, with central 

 strand ; branches leafy, cylindric, simple, pinnate or bi-pinnate ; 

 paraphyllia numerous ; leaves dimorphous, the rhizome and 



