106 American Midland Najuralist Monograph No. 6 



long tapering abruptly into a seta about two-thirds as long, 8-costate, when 

 dry much constricted below the mouth and very deeply 8-plicate, somewhat 

 sinistrorse, reddish-brown; peristome-teeth lighter in color, granulose, with 

 distinct divisurals, when dry closely reflexed, when moist erect, segments linear, 

 shorter than teeth; calyptra narrowly conic-mitrate, non-hirsute and plicate; 

 spores globose, somewhat papillose, incrassate, about .017 mm in diameter. 

 On bark of living trees (often on apple and butternut trees. — Strout); 

 Europe, Asia, northern Africa, and from Nova Scotia to Georgia and Iowa. 



Scarce in our region. Allegheny Co.: On base of Quercus imbricaria in mixed pine 

 and oak woods at Dutil Church, near Douthett, December 29, 1908. O.E.J, (figured). 

 McKean Co.: Bradford. D. A. Burnett. (Porter's Catalogue). 



4. Orthotrichum ohioense Sullivant 



(O. canadense Sullivant, not Bryologia Europaea) 

 Plate XIX 



Densely cespitose, yellowish green above, dark or brownish below: stems 

 freely branching, about 6-10 mm high; leaves lanceolate from an oblong base, 

 about 1.5-3 mm long, spreading to ascending, bluntly acute to rounded-obtuse, 

 papillose with entire and revolute margins; costa strong, ending at a little 

 below the apex; median leaf-cells quadrate to rectangular, moderately incras- 

 sate, towards the margins and upwards becoming smaller, more incrassate, 

 quadrate, sub-papillose, the upper small, rounded, densely papillose, incrassate: 

 seta shorter than the urn; capsule more or less completely immersed, ovate- 

 oblong when moist to somewhat narrower and pyriform-campanulate when dry, 

 symmetric, when dry 8-striate, pale yellow, tapering at base, slightly con- 

 stricted below the mouth; exothecial cells at mouth in one to three rov/s, small, 

 quadrate, below abruptly rounded and strongly incrassate, on the main body 

 of the urn rectangular and much smaller; stomata immersed, the outer peri- 

 stome of 8 double teeth, yellowish-pellucid, densely puncticulate, triangular- 

 lanceolate, 5-7-articulate; segments of inner peristome of 8 short, linear-subu- 

 late segments of two rows of cells; calyptra conic-campanulate, yellowish, 

 plicate, densely erect-hairy; operculum low-convex, apiculate rostrate; spores 

 yellowish-brown, pellucid, densely papillose, .01 8-. 020 mm, mature in spring. — 

 about April: autoicous, antheridial clusters axillary. 



On bark of trees. New Brunswick to Ontario and south to Georgia. 



Probably rather common in our region. Ashtabula, Ohio, and as follows: Erie Co.: 

 On bark of Populus deltoides, Presque Isle, September 20-22, 1906. O.E.J. McKean 

 Co.: Langmade, Bradford, May 8, 1898. D.A.B. (figured). Washington Co.: On 

 bark of fallen willow. Hackney Station, A. Linn and J. S. Simonton, April 27, 1894. 



4a. Orthotrichum ohioense var. citrinum (Austin) 



Lesquereux and James 



(O. citrinum Austin) 



Leaves dark green, narrowly lanceolate; capsule thin, yellow. 



On bark of trees and with about the same range as the species. 



Occurs in our region at Painesville, Ohio, and as follows: Westmoreland Co.: T. 

 P. James. (Porter's Catalogue). 



