354 A MANUAL OF MOSSES 



Huntingdon : Alexandria. T. C. Porter (Porter's Cata- 

 logue. 



McKean : Bolivar and Bennett divide on shaded 



dripping rocks, April 21, 1895 (Figured), 

 and on perpendicular faces of rocks, 

 Lewis' Run, April 25, 1895. D. A. B. 



8. RHYNCHOSTEGWM Bryologia Europsea. 



Autoicous : more or less robust to quite slender, mostly 

 soft, cespitose, pale green to dark green, rarely yellowish to 

 golden-brown, more or less lustrous : stem creeping, bearing 

 rhizoids, sometimes stolon-like, irregularly to pinnately 

 branched; branches more or less thickly-leaved, often com- 

 planate; leaves spreading, rarely imbricate, shortly or non-de- 

 current, mostly a little concave, non-plicate, ovate to lance- 

 ovate from a narrowed base, with a short or long point, mostly 

 serrulate, the margin basally reflexed ; costa simple or rarely 

 forked, ending in about the middle of the leaf ; median leaf- 

 cells mostly narrowly prosenchymatous, smooth, the basal 

 shorter and wider, the alar not differentiated, sometimes short- 

 rectangular or quadrate ; inner perichsetial leaves sheathing", 

 abruptly subulate and reflexed from the middle : seta more or 

 less elongate, smooth; capsule cernuous to horizontal, oval 

 and weakly gibbous dorsally to oblong or oblong-cylindric and 

 almost symmetric, often constricted below the mouth when 

 dry and empty ; annulus present ; peristome as in Brachythe- 

 cium ; lid long-rostrate from a convex-conic base; calyptra- 

 glabrous. 



About 113 species, occurring on earth and stones, mostly 

 in the temperate and sub-tropic regions ; about 8 species in 

 North America ; probably only the following in our region : 



1. Rhynchostegium serrulatum (Hedwig) Jaeger. 



(Hypiinm serrulatum Hedwig). 



(Plate LIV) 



Loosely matted, bright yellowish-green, when dry sub- 

 lustrous : stems creeping, sub-pinnately branched with long 

 and more or less 2-ranked branches ; branch-leaves com- 

 planate, 1.5-2 mm. long, thin, concave, ovate-lanceolate, acumi- 

 nate, serrulate from usually below the middle, thinly-costate 

 to the middle or beyond, the apex often twisted, the margin 

 plane and not bordered ; perichsetial leaves similar but more 

 oblong; stem-leaves similar but relatively wider and more 

 cordate; median leaf-cells linear, prosenchymatous, about 

 8-10:1, at base somewhat broader and shorter, the alar not 

 differentiated : seta about 2.5 cm. long, smooth, castaneous, 

 sinistrorse when dry; capsule light yellow to dark castaneous. 



