Jennings: Manual of Mosses — 8. Orthotrichaceae 109 



apex rather obtuse, the margin entire and often recurved; costa strong, reddish, 

 sub percurrent; basal leaf-cells at margin quadrate, hyaline, towards the costa 

 rectangular to linear-vermicular, reddish-pellucid, the median cells rounded- 

 quadrate, incrassate, slightly papillose, the apical cells similar; capsule pyriform, 

 tap>ering into a slender dextrorse seta, seta and capsule together about 3.5 mm 

 long, capsule strongly costate but with a very small mouth and, even when 

 dry, smooth and plicate only immediately below the mouth, pale yellowish- 

 brown, stomata superficial at the base of the urn; calyptra narrowly conic- 

 mitrate, hairy; lid rosteliate; peristome single, or rarely with rudimentary seg- 

 ments, teeth somewhat paired but split apart above, when dry erect, narrowly 

 triangular, granulose, distinctly articulate, with a distinct divisural; spores 

 papillose, globose, about .020-. 022 mm in diameter, mature in summer. 



On tree-trunks in woods, usually in mountainous or hilly country; Europe, 

 and in North America from the Gulf of St. Lawrence to Ontario and south 

 to North Carolina. 



Rather uncommon in our region. Centre Co.: Bear Meadows. T. C. Porter. (Por- 

 ter's Catalogue). McKean Co.: Rutherford, March 6, 1893. D.A.B. (figured). Som- 

 erset Co.: Bark of Butternut tree, Fall Run, near Barronville, John F. Lewis, May 17, 

 1930. Washington Co.: Linn and Simonton. (Porter's Catalogue). 



3. Ulota crisp a [Linnaeus] Bridel 

 {Ulota ulophylla Brotherus; Orthotrichum crispum Hedwig) 



Plate XX 



Densely cespitose, yellowish-green above, darker below, the tufts about 8 

 mm high: stems sparingly branched, growing perpendicular to the bark on 

 which it is found, sometimes decumbent at base; leaves straight and erect- 

 spreading when moist, when dry much crisped, narrowly lance-ovate to sharply 

 acute to acuminate at the apex, concave and more or less carinate, often 

 marginally revolute; marginal basal leaf-cells hyaline, the inner basal pellucid, 

 linear, often somewhat vermicular, the median cells incrassate, rounded, bluntly 

 papillose, the apical cells smaller and less papillose; costa strong, sub-percurrent; 

 seta and capsule together about 4 mm long, capsule ovate-globose when wet, 

 about 1 mm long, tapering rather gradually into the neck and seta, when dry 

 somewhat constricted below the m.outh, with the neck and seta dextrorse, the 

 costa brownish-pellucid; annulus brown, pellucid, of about 3 series of small, 

 close-set, rounded, cells; teeth triangular-lanceolate, united into 8 pairs, when 

 dry reflexed, each pair confluent and cribrorse at apex, often split along the 

 divisural below; segments 8, consisting of two rows of cells nearly up to the 

 apex, a little shorter than the teeth; spores globose, about .023-.026 mm, 

 mature in summer. 



On trees in woods; Europe, Asia, Tasmania, Alaska, and from Newfound- 

 land to Georgia and west to Minnesota. 



Fairly common in our region, especially on black oak trunks. Now known from Alle- 

 gheny, Butler, Cameron, Centre, Crawford. Fayette, McKean, Potter, Washington, and 

 ^X'estmoreland counties. Specimen figured: on black oak truunk. Bald Eagle Mt., near 

 Matternville, Center Co., Sept. 22, 1909. O.E.J. 



