Jennings: Manual of Mosses — 31. Hypnaceae 23'> 



dered, cross-striate, apically pale and papillose, the margin step-like, trabeculae 

 numerous; inner peristome yellowish, with high basal membrane, segments 

 keeled, narrowly carinately split, cilia 1-3, shorter than the segments and 

 nodose; lid high-convex, apiculate; spores small. 



A genus mainly confined to South America and embracing about 20 

 species; only 1 species occurs in North America and this occurs rarely in our 

 region. 



1. SciAROMiUM Lescurii (Sullivant) Brotherus 



(Hypnum Lescurii Sullivant; Amblysiegium Lescuni Jaeger) 



Plate XLIII 



Loosely cespitose, dull, dark green to blackish-green: stems closely and un- 

 equally branched, the branches as described for th: genus, but often with 

 short branchlets, 1-1.5 cm long, more or less erect, and pinnately disposed; 

 leaves of the stem thick, rather opaque, erect-spreading, entire below to sub- 

 serrulate all around, broadly ovate-cordate to oblong-ovate, 1-1.3 mm long, 

 abruptly short-acuminate, the branch-leaves similar but more lance-ovate; 

 median leaf-cells prosenchymatous, hexagonal to oblong, about 1-3:1, nor 

 much differentiated except for the yellowish or cactancous border which is 

 composed of 4 or 5 rows of linear, prosenchymatous, fle.xuous, highly incras- 

 sate cells, the border cells in the alar region becoming short and rectangular or 

 obliquely quadrilateral; costa very strong, castaneous or yellowish, merging 

 at apex into the border: seta 1-3 cm long, reddish; capsule reddish, short- 

 necked, the urn about 2.5 mm long, oblong, cernuous, somewhat arcuate; the 

 teeth confluent at base, hyaine-papillose above, yellowish below, dorsally lam- 

 ellate and cross-striate, numerously trabeculate, hyaline-margined; segments 

 yellowish, carinately split and about as long as the teeth, the basal membrane 

 about two-fifths as high; cilia 3 (or 4), pale, papillose, nearly as long as seg- 

 ments; annulus compound; spores mature in late spring or early summer, 

 castaneous, medium-walled, smoothish, about .012-.015 mm; lid conic-apiculate. 

 On stones and rocks in streams, usually in mountainous or hilly regions; 

 occurring from New England to Ontario, Alabama p.nd Georgia. 



Rare in our region. Fayette Co.: Ohio Pyle, May 30-31. 1908. 6.E.J. (figured). 



8. Drepanocladus (C Mueller) Roth 



Dioicous, rarely autoicous: mostly robust, often densely cespitose, green to 

 yellowish or brownish, lustrous: stem procumbent to erect, often floating, vari- 

 ously pinnate, the ends of the shoots usually circinate: leaves usually more or 

 less circinate-secund, rarely erect to squarrose, more or less concave, from a 

 mostly narrowed and decurrent base ovate- to triangular- or cordate-lanceolate, 

 acute to prolonged acuminate, entire or serrulate; costa mostly simple and 

 thin, ending usually above the middle of the leaf, sometimes strong and p>er- 

 current or even excurrent; leaf-cells mostly long-linear, smooth, in the more or 

 less excavate angles parenchymatous, thin-walled, hyaline and inflated or thick- 

 walled and colored, usually forming a well-defined group sometimes reaching 

 to the costa; inner p)erichaetial erect, mostly plicate, elongate-subulate: seta 



