164 American Midland Naturalist Monograph No. 6 



much shorter than the capsule, towards the apex spinulose-hairy; operculum 

 hemispheric-conic, shining, dark chestnut-brown, terminating in an oblique 

 linear-subulate rostrum 1.8 mm long. Known from the following ocalities: 



In western Pennsylvania this moss is thus far known only from the extreme south- 

 western counties, as follows: Allegheny Co.: Along a shaly roadside bank at the west 

 end of Fern Hollow Bridge, Pittsburgh. O. E. Jennings, March 8, 1903. Type (figured). 

 Two pockets of specimens deposited in the Pennsylvania Herbarium of the Carnegie Mu- 

 seum). Same locality March 26, 1910. O.E.J.; Stoops Ferry, October 7, 1905. O.E.J, 

 and G.E.K.; Library P.O., Apnl 29, 1906. O.E.J. Beaver Co.: Beaver Falls, May 11, 



1907. O.E.J. Bedford Co.: Wills Mt., near Hvndman, October 9, 1904. O.E.J. BuT- 

 inp Co.: Valencia, September 27, 1905. O.E.J. Fayette Co.: Ohio Pyle, May 30-31, 



1908. O.E.J. Greene Co.: 2 mi. e. of Waynesburg. C.M.B. Apr. 23, 1938. Law- 

 pi-, nce Co.: Ravine below Graceland Cemetery, New Castle. 1906. Susan Gageby. 

 Washington Co.: Hanlin, May 23, 1908, and Charleroi, June 24, 1908. O.E.J. 

 Westmoreland Co.: "Shades," east of Blackburn, March 25, 1910. O.E.J, and G.K.J. 



5. Atrichum angustatum var. PLURILAMELLATUM (Jennings) Frye 



{Catharinaea plurilamellata Jennings) 



Plate XXXI 



Loosely cespitose, dark green, dioicous: stems simple or sparsely branched 

 below, slightly radiculose towards the base, about 1.5 cm tall, erect, flexuous, 

 reddish-brown; lower leaves dark green to purplish, short, becoming abruptly 

 longer above; upper leaves clustered, erect-spreading to erect, linear-lanceolate 

 4-7 mm long, .9-1.3 mm broad, margined, above with chlorophyll, obtuse to 

 sub-acute, toothed on the back towards apex, more or less doubly serrate in the 

 apical third, not very strongly undulate when damp, crisped and circinate 

 when dry; lamellae 7-12 in number, 8-14 (usually about 11) cells high, smooth 

 or sometimes sparsely minutely papillose, usually occupying from 1/2 to 2/3 

 of the width of the median part of the leaf; lower cells rectangular, about 

 .010-.016 X .025-.035 mm, the upper rounded-quadrate, about 007-.013 mm, 

 the lower marginal cells linear, incrassate, 2- to 3 -seriate and more or less 

 bi-stratose, towards the apex becoming rectangular, with triangular teeth about 

 .025-. 040 mm long; perichaetial leaves similar: seta solitary, erect, flexuous, 

 somewhat sinistrorse, about 1.5-2 cm long, smooth, shining, reddish-brown; 

 capsule oblong-cylindric, 4-5 mm long, 0.6-0.9 mm in diameter, erect, arcuate, 

 abruptly tapering at the base, reddish-brown, smooth, shining when fresh; 

 peristome teeth 32, linear-oblong, about .25 mm high, reddish-orange along 

 median portion, hyaline towards margins, when young with densely minutely 

 papillose margins, the lower one-fourth portion united into a basal membrane; 

 spores smooth, incrassate, orange-pellucid, globose, about .008- .011 mm; calyp- 

 tra about 5-6 mm long, narrowly cucullate, extending to about the middle of 

 capsule, spinulose-hairy on apex; operculum hemispheric-conic, shining reddish- 

 brown, terminating in a linear-subulate oblique beak about 2 mm long. 



Known only as follows: Allegheny Co.: Powers Run, September 21, 1905, May 

 30-31, 1908. O.E.J. Fayette Co.: On shaded woodland bank, Ohio Pyle. O.E.J, and 

 G.E.K., September 10, 1905 (figured). Type. (Deposited in Pennsylvania Herbarium of 

 the Carnegie Museum). Westmoreland Co.: Miss K. R. Holmes, 1902. 



