Jennings: Manual of Mosses — 5. Pottiaceae 87 



membrane at the base twisted into about two turns dextrorsely; spores smooth- 

 ish, yellowish, about .009-.0I2 mm, mature from November to spring: dioicous. 

 A quite variable species occurring on moist earth, banks, stones, walls, etc., 

 in Europe, Asia, northern Africa, and throughout southern Canada and 

 northeastern United States. 



Allegheny Co.: Schenley Park, Pittsburgh, August, 1905 (figured); Fern Hollow, 

 Pittsburgh, January 21, 1906, and Powers Run, November 30, 1909. O.E.J. Butler 

 Co.: T. P. James. (Porter's Catalogue). Centre Co.: T. C. Porter. (Porter's Cata- 

 logue). Huntingdon Co.: T. C. Porter. (Porter's Catalogue). McKean Co.: West 

 Branch Swamp, Bradford, April 10, 1894. D.A.B. Washington Co.: Grove Sta.. 

 near Washington. Nov. 5, 1892. Lmn & Simonton. Westmoreland Co.: T. P. 

 James. (Porter's Catalogue). 



3. Barbula convoluta Hedwig 



Plate XVII 



Densely cespitose, yellowish-green: stems 1-3 cm high, usually about 1-1.5 

 cm, erect, branching; leaves about 1-1.5 mm long, when dry crisped, when 

 moist erect-spreading, often somewhat recurved, lance-oblong to lance-linear 

 or Ungulate, rounded to obtuse, sometimes sub-acute, concave, the margins 

 mostly plane or slightly recurved on one side at base, mostly minutely crenu- 

 late with bifid papillae; basal leaf-cells elongate-rectangular, pellucid to hyaline, 

 rather incrassate, smooth, median and upper leaf-cells elongate-rectangular, 

 pellucid to hyaline, rather incrassate, smooth, median and upper leaf-cells 

 small, sub-quadrate, densely papillose, strongly incrassate, often rather ob- 

 scure; costa strong, yellowish-pellucid, ending below apex or rarely shortly 

 apiculate-excurrent; perichaetial leaves high-convolute-sheathing, the inner ecos- 

 tate: seta erect, about 1.5 mm long, yellow, or reddish when old, sinistrorse 

 below, dextrorse above; capsule small, symmetric, erect, reddish-brown, narrow- 

 ly oblong, the urn about 1.5 mm long; lid conic-rostrate, oblique, about 1 mm 

 long, the cells spirally arranged; exothecial cells narrow, elongate-rectangular, 

 brownish or yellowish pellucid, two or three series at the rim much smaller, 

 sub-quadrate and darkly obscure; annulus distinct and narrow; peristome-teeth 

 consisting of 32 filiform articulate divisions several times dextrorsely twisted 

 from a low basal membrane; spores brownish-pellucid, medium-walled, smooth- 

 ish, about .016-. 018 mm, mature in spring: dioicous. 



On soil, especially in calcareous districts, Europe, Asia, northern Africa, 



and from southern Canada to Florida, Kansas, and California. In our region 



occurring at Latshaw, southern New York, near the Pennsylvania State-line 



(figured) and as follows, — not common: 



Lawrence Co.: Enon Valley. T. P. James. (Porter's Catalogue). Lycoming Co.: 

 McMinn. (Porter's Catalogue ) . 



9. Acaulon C. Mueller 



(Sphaerangium Schimper) 

 Dioicous: minute, bud-like, brown, gregarious: stem very short and few- 

 leaved, without central strand, unbranched, green protonema persistent; leaves 

 erect-spreading, broadly ovate, keeled or concave, above with revolute and 



