Jennings: Manual of Mosses — 8. Orthotrichaceae lO'? 



triangular-lanceolate, about 8-articulate, the divisural distinct and the teeth 

 often split; the three or four upper rows of cells of the capsule densely incras- 

 sate, brown, pellucid like the costal and laterally oblong; spores globose, papil- 

 lose, .01 7-. 020 mm, mature in summer. 



On rocks, mostly limestone, from Alabama to Missouri, Minnesota, and 

 New England. 



Rare in our region. Cambria Co.: Cresson. James. (Porter's Catalogue). Centre 

 Co.: On limestone 2 mi. w. of Scotia, Sept. 22, 1909. O.E.J, (figured). Westmore- 

 land Co.: On rocks. Chestnut Ridge above Hillside. Sept. 23, 1910. O.E.J. &C G.K.J. 



2. Orthotrichum Lescurii Austin 



(O. cupulatum var. minus Sullivant) 

 Plate XIX 



Rather densely cespitose, about 5 mm high: stems thickly-foliate, branched; 

 leaves lanceolate or som.e of the lower ovate, the upper about 3 mm long, the 

 lower shorter, acute, the margins entire, revolute, strongly costate nearly to 

 the apex; basal leaf-cells quadrate to e'ongate-rectangular, smooth, hyaline, 

 above becoming rounded-hexagonal, sub-opaque, densely papillose, smaller and 

 quite regularly he.xagonal at the apex; seta very short, 5 mm, about one-half 

 enclosed in the involucre; calyptra narrowly campanulate, plicate, hirsute with 

 erect hairs; lid mamillate, rounded but flattened; capsule oblong-cylindric and 

 rather suddenly tapering to the seta, about 1.3 mm high and 0.5 mm in thick- 

 ness, when moist globose-oblong and 8-striate, when dry deeply 8 furrowed and 

 sometimes contracted below the mouth; capsule always about the sam.e length 

 as the upper leaves, or sometimes slightly exserted when dry; peristome single, 

 the teeth 8, short, equidistant but leaning towards each other in pairs, triangu- 

 lar-lanceolate, papillose, articulate, the divisural usually complete and often 

 split, teeth when dry erect or incurved; spores mature in spring, .014-. 017 mm. 



On rocks, usually granite or trap; from New England to Ontario south 

 to Missouri and Pennsylvania, and in the Rocky Mountains to British 

 Columbia. 



Rare in our region. Westmoreland Co.: On sandstone rocks at mouth of Bear's 

 Cave, on slope of Chestnut Ridge above Hillside, September 16, 1910. O.E.J, and 

 G.K.J, (figured). 



3. Orthotrichum stellatum Bridel 



(O. Braunn Bryologia Europaea; O. strangulatum Sullivant) 



Plate XIX 

 Sparsely cespitose to scattered, less than 5 mm high, dark green: stems 

 sometimes creeping at base, erect-spreading, simple or branched; leaves spread- 

 ing when moist, the upper somewhat clasping, when dry appressed, not crisped, 

 concave, ovate to lance-ovate, the margins more or less revolute, apex sub-acute 

 to obtuse, sometimes erose-denticulate and sometimes hyaline; costa strong, 

 sub-percurrent basal leaf -cells hyaline, smooth, at margin quadrate, about .016 

 mm in diameter, toward the costa rectangular and reaching about .090 x .016 

 mm, median cells papillose, opaque, rounded, about .020 mm in diameter, the 

 apical smaller, rounded and less papillose; capsule oblong-oval, about 1.2 mm 



