OF WESTERN PENNSYLVANIA 99 



2. Barbula unguiculata [Hudson] Hedwig. 

 (Plate XIII) 



Densely cespitose, yellowish-green : stems erect, somewhat 

 branching, usually about 1 cm. high ; leaves about 2 mm. long, 

 erect-spreading, somewhat recurved, when dry spirally im- 

 bricate and twisted, oblong-lanceolate, sometimes lingulate, 

 obtuse, mucronate, entire, the margin recurved below, plane 

 above; costa strong, excurrent and thus forming the rounded 

 mucro; upper leaf-cells small, about .008-010 mm., rounded- 

 quadrate, incrassate, strongly papillose, obscure, the basal 

 elongate-rectangular, yellowish-pellucid to more or less hya- 

 line, the marginal not different ; pericha;tial leaves longer and 

 more erect : seta erect, castaneous, lustrous, about 1 cm. high, 

 when dry sinistrorse ; capsule oblong-cylindric, deep-castane- 

 ous, the urn about 1.8 mm. long, erect, exannulate, rather 

 smooth when dry and empty; lid about one-third as long as 

 urn, conic-rostrate, slightly curved or straight; the 16 peris- 

 tome-teeth castaneous, pellucid, papillose, cleft to the base into 

 32 filiform divisions, from a narrow membrane at the base 

 twisted into about two turns dextrorsely; spores smoothish, 

 yellowish, about .009-.012 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 northern United States. 

 Common in our region. 



Allegheny : Schenley Park, Pittsburgh, August, 1905. 



(Figured) ; Fern Hollow, Pittsburgh, Jan- 

 uary 21, 1906, and Powers Run, Novem- 

 ber 30, 1909. O. E. J. 



Butler : T. P. James. (Porter's Catalogue). 



Center : T. C. Porter. (Porter's Catalogue). 



Huntingdon : T. C. Porter. (Porter's Catalogue). 



McKean : West Branch Swamp, Bradford, April 10, 



1894. D. A. B. 



Westmoreland : T. P. James. (Porter's Catalogue). 



3. Barbula convoluta Hedwig. 

 (Plate XIII) 



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 lingtilate, 

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

 mostly plane or slightly recurved on one side at base, mostly 

 minutely crenulate with bifid papillae ; basal leaf-cells elongate- 

 rectangular, pellucid to hyaline, rather incrassate, smooth, 



