OF WESTERN PENNSYLVANIA 99 



2. Barbula unguiculata [Hudson] Hedwig. 



(Plate XIII) 



Densely cespitose, yellowish-green : stems erect, somewjiat 

 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 ; pericluetial leaves longer and 

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

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

 ons, 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 

 Center 

 Huntindon 





McKeaii 



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

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



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

 West Branch Swamp, Bradford, April 10. 

 1894. D. A. B. 

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



3. Barbula convoluta Heel wig. 

 (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 lingulate, 

 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. 



