306 American Midland Naturalist Monograph No. 6 . 



1 cm long, rough throughout; capsule oval to oblong or turgid-ovate, dorsally 

 somewhat gibbous about 2-3:1, inclined, about 2 mm long; annulus simple, 

 persistent; lid conic to short- rostrate; peristome normally hypnoid, segments 

 shorter than the teeth, carinately split, the cilia 2, somewhat shorter; rather 

 uncommon, capsules rarely produced. 



In moist woods and shady places on rocks or earth; from New Brunswick 

 to Minnesota and south to Georgia. 



Rare in our region. Huntingdon Co.: Alexandria. T. C. Porter (Porter's Cata- 

 logue). McKean Co.: 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. 

 Warren Co.: South Fork of Ten-Mile Creek, 2 miles southwest of Jefferson. March 15, 

 1942. C.M.B. 



9. Rhynchostegium Bryologia Europaea 



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 complanate; leaves spread- 

 ing, rarely imbricate, shortly or non-decurrent, 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 differen- 

 tiated, sometimes short-rectangular or quadrate; inner perichaetial leaves sheath- 

 ing, abruptly subulate and reflexed from the middle: seta more or less elon- 

 gate, smooth; capsule cemuous 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 130 species, occurring on earth and stones, mostly in the temperate 

 and sub-tropic regions; about 10 species in North America; probably only the 

 following in our region: 



1. Rhynchostegium serrulatum (Hedwig) Jaeger 



(Hypnum serrulatum Hedwig; Eurynchium serrulatum Lindberg) 



Plate LIX 



Loosely matted, bright yellowish-green, when dry sub-lustrous: stems creep- 

 ing, sub-pinnately branched v/ith long and more or less 2-ranked branches; 

 branch-leaves complanate, 1.5-2 mm long, thin, concave, ovate-lanceolate, acu- 

 minate, serrulate from usually below the middle, thin-costate to the middle or 

 beyond, the apex often twisted, the margin plane and not bordered; perichaetial 

 leaves similar but more oblong; stem-leaves similar but relatively wider and 

 more cordate and with more distinct alar cells; median leaf-cells linear, prosen- 

 chymatous, 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, oblong, cernuous, incurved, when 



