Jenn.ngs: Manual of Mosses — 24. Fontinalaceae 179 



1. Dichelyma capillaceum [Dillenius] Bryologia Europaea 

 (D. pallescens Sullivant and Lesquereux; Fontinalis capillacea Hedwig) 



Yellowish above, brownish to blackish below; stems slender, often 10-15 

 cm long, with a few distichous, divaricate, or one-sided branches; leaves erect- 

 spreading, secund to falcate-secund, long-linear from a lance-oval base, about 

 5-7 mm long, serrulate towards the apex; costa long-excurrent; perichaetial 

 leaves linear, thin, ecostate, pale and twisted and reaching above capsule; leaf- 

 cells narrow, linear-rhomboid: seta short, slender; capsule small, pale yellowish, 

 thin-walled, ovate, the urn truncate and about 1.5-2:1, finally laterally emerging 

 from the perichaetium; lid high-conic; peristome double, the teeth shorter than 

 the inner peristome, narrowly linear, densely papillose, segments longer than 

 teeth, constricted at the articulations, pale yellow, papillose, forming a con- 

 nected lattice-work only above; spores mature in late summer. 



On sticks and the bases of bushes in and around the edges of slow streams, 

 ponds, and swamps; Europe and from New Brunswick and Ontario southward 

 to North Carolina and Tennessee. Yot yet recorded in our region. 



2. Dichelyma pallescens Bryologia Europaea 



(Fontinalis capillacea Hooker) 

 Plate XXXV 



Slender, light yellowish-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 rhomboid-linear, prosenchymatous, about 8-15:1, 

 rather incrassate, the basal colored and somewhat shorter, a few alar indistinctly 

 wider and oblong, incrassate, the apical shorter; perichaetial leaves about as 

 long or usually longer than the seta and capsule together: seta about 4 mm 

 long, slender, enclosed in the perichaetium; capsule small, thin, ovate, yellow- 

 ish, about 1 mm long, truncate by the falling away of the lid, emerging later- 

 ally from the perichaetum; lid high-conic; peristome-teeth linear, rather rudi- 

 mentary, pale, castaneous-pellucid, with distinct divisural and lamellae, and 

 about 10-12 castaneous-pellucid, low ventral trabeculae; segments filiform, 

 longer than teeth, united only at the summit or entirely free, sometimes re- 

 maining on the ripe capsule only as short, filiform, cilia-like structures between 

 the teeth; exothecial cells rounded, castaneous-pellucid, incrassate-collenchymat- 

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

 taneous-pellucid, incrassate, minutely papillose, varying from about .016- 

 .025 mm. 



More or less inundated on sticks and the bases of bushes along creeks and 

 around ponds; New Brunswick to Minnesota and Pennsylvania. 



Not yet found in our region, excepting along the northern border. McKean Co.: 

 Bradford. D.A.B. (Porter's Catalogue); Riverside, New York, a few miles north of 

 Bradford. D.A.B. October 18, 1897 (figured). 



