Jennings: Manual of Mosses — 29. Leskeaceae 211 



ovate-acuminate, about 0.2-0.3 mm long, concave and with a shorter costa; 

 perichaetial leaves erect, slenderly lance-acuminate, the acumen more or less 

 reflexed: seta about 2-2.5 cm long, slender, dark yellow or brown and sinis- 

 trorse when old; capsule yellowish, oval-oblong, cernuous to horizontal, the 

 urn about 2 mm long, when dry somewhat constricted below the rim; lid 

 obliquely subulate-rostrate and about 1 mm long; peristome castaneous, the 

 teeth slender, densely trabeculate, the dorsal lamellae cross-striate and pro- 

 jecting to form a narrow margin, the divisural distinct; segments as long as 

 the teeth, split carinately, arising from a basal membrane about one-third as 

 high, cilia usually 2, articulate, nearly as long; spores about .010-.012 mm, pale 

 brown, medium- walled, slightly roughened, mature in fall. 



On rotten logs and stumps and at the base of trees in woods. Europe. In 

 North America from Florida and Mexico north to New Brunswick and 

 Minnesota. 



In our region known from Allegheny, Blair, Fayette, Huntingdon, McKean and Wash- 

 ington counties. Specimen figured: On stump. Meadow Run Valley, 4 mi. s. of Ohio 

 Pyle. Sept. 1-3, 1906. O.E.J. & G.K.J. 



2. Thuidium pygmaeum Bryologia Europaea 



Plate LXVI 



Minute, rather harsh, in dull, olive or yellowish green, thin, interwoven 

 mats; bi-pinnate, 1-2 cm long; branches capillary; with insignificant simple 2-5- 

 celled paraphyllia; stem-leaves triangular-ovate but acuminately narrowed, the 

 lower margins often more or less reflexed, median cells pluripapillate, incras- 

 sate, hexagonal-quadrate, about .006 mm in diameter; primary branch-'eaves 

 long, ovate with obtuse or sub-acute apex; seta about 1.5 cm long; capsule in- 

 clined to horizontal, unsymmetrical, wide-mouthed; annulus conspicuous; lid 

 conic, obliquely rostrate; peristome complete; spores ripening in fall. 



Mostly on stones (or soil) in calcareous districts. So stiff and intricately 

 interlaced that it is difficult to separate out individual plants. First described 

 from specimens collected at Columbus, Ohio. Range now extended to Penn- 

 sylvania, New Jersey, and Canada. 



Washington Co.: Linn and Simonton. On stones, in a shaded ravine, McCracken 

 Station, vicinity of Washington. Sept. 24, 1892 (figured). 



3. Thuidium abietinum [Linnaeus] Bryologia Europaea 



(Hypnitm abietintim Bridel ) 



Large, yellowish-green above, brownish below, in dense tufts or mats; stem 

 5-12 cm long, regularly pinnate, stiffly ascending-erect, the branches 2-10 mm 

 long, unequal, attenuate, slender, terete when dry; stem-leaves crowded, ovate, 

 acuminate, 0.85 mm wide by 1.3 mm long, deeply bi-plicate with margins pap- 

 illose-serrulate; costa strong ending well above the middle; median cells oval- 

 rhombic, uni-papillate, about .010 mm in diameter; branch-leaves smaller, with 

 one or two papillae on the apical cell; inner perichaetial leaves plicate, with 

 toothed but not ciliate margin; seta 1.5-3 cm long; capsule cylindric, curved, 



