Jennings: Manual of Mosses — 31. Hypnaceae 26'> 



Rare in our region. McKean Co.: Rutherford Rocks, on moist and densely shaded 

 fragments of sandstone at base of cliff, May 5, 1895, and Hawkin's Hollow, August 2, 

 1895. D.A.B. (figured). 



6. Stereodon curvifolius (Hedwig) Mitten 



{Hypnum curvifolium Hedwig) 

 Plate L 



Robust, lustrous, yellowish-green in large flat mats: stems prostrate, rather 

 regularly pinnately branched, the branchlets short and unequal, the whole 

 plant complanately secund; leaves crowded, imbricate in two rows, falcate- 

 serund, thus giving to the plants a plaited appearance from the dorsal view- 

 point; stem-leaves about 0.7-0.8x1.4-1.8 mm, oblong-ovate to elongate and 

 triangular-ovate, long-acuminate, plane-margined, crenulate-serrulate about to 

 the middle, and at the angles, concave, at the base abruptly narrowed and 

 cordate or sub-cordate, somewhat decurrent; costa none or double and faint; 

 branch-leaves similar but proportionally shorter and narrower, about 0.4-0. 5-x- 

 1-1.5 mm; median leaf-cells about .005-.007 x .035-.050 mm, linear-vermicular, 

 basal median cells incrassate, porose, more or less vermicular to linear-oblong, 

 a few of the alar cells sub-quadrate, yellowish or brownish and incrassate, 

 about .020-.025 mm in diameter, the decurrent cells enlarged, thin-walled, and 

 hyaline; perichaetial leaves erect, whitish, numerous, the inner sheathing, pli- 

 cate, reaching 4-5 mm long: seta about 2.5 cm long, dextrorse above, sinis- 

 trorse below, castaneous, sub-lustrous; capsule about 2.5 mm long, pale cas- 

 taneous, constricted below the mouth when dry and empty and then also 

 strongly plicate, the urn oblong, arcuate, cemuous; lid conic, apiculate; peri- 

 stome normally hypnoid, teeth yellov/ish pellucid, slender, strongly trabecu- 

 late, the lamellae and divisural distinct, the apical portion of the teeth hyaline 

 and papillose, the lower dorsal surface cross-striolate; segments about as long 

 as the teeth, slender, slightly carinately cleft, pale yellowish-pellucid, cilia two 

 or three, about as long as segments, articulate, hyaline, papillose; annulus 3- 

 seriate, revoluble; spores yellowish, medium-walled, granulose, about .019-.023 

 mm, mature in early spring. 



On soil, rocks, or more usually on decaying logs in moist, cool woods; 

 Asia, and from Arctic America south to Georgia, Missouri, and Colorado. 

 Common in our region. The type was from Lancaster, Pennsylvania. 



Now known from the following counties: Allegheny, Armstrong, Beaver, Butler, Cam- 

 bria (Porter), Crawford, Erie. Fayette, McKean. Mercer, Somerset, Washington, and 

 Westmoreland. Specimen figured: Pymatuning Swamp near Linesville, Crawford Co., 

 May 12, 1908. 



7. Stereodon Patientiae Lindberg 



{Hypnum arcuatum Lindberg; H. LinJbergii Mitt.; H. Patientiae 

 Lindberg; Stereodon arciiatus Lindberg) 



Plate L 



Robust, widely cespitose in yellowish-green mats, usually more or less 



regularlv pinnate, lustrous at least on the younger parts: stems prostrate, 



usually sparsely branched; stem-leaves about 1.6-2.2 mm long, complanately 



falcate-secund, lustrous, ovate-oblong, decurrent, the margins plane and entire 



