196 American Midland Naturalist Monograph No. 6 



slender, reaching about to the leaf-middle; median leaf-cells pellucid, rhom- 

 boid-elliptic, with long, slender, simple dorsal papillae; apical leaf -cells linear, 

 the basal larger and looser, the alar quadrate to rectangular, almost smooth, 

 rather incrassate; perichaetial leaves numerous, the inner lance-oblong, nar- 

 rowly acuminate, ciliate-fimbriate in the upper part: seta about 1 cm long; 

 capsule narrowly oblong-cylindric, about 2.5 x 0.5 mm, erect, symmetric, thin- 

 walled; peristome-teeth linear, distinctly lamellate, the inner basal membrane 

 truncate and about one-third as high as the teeth, peristome whitish; spores 

 pale yellow, mature in fall, thin-walled, about .012-.015 mm, smooth. 



On trunks and roots of trees and on stumps, in woods; from New England 

 and Ontario to Kansas and the Gulf States. 



Not often collected in our region. Erie Co.: In oak woods, Presque Isle. May 8-9, 

 1906. O.E.J. McKean Co.: On trees, near the ground. Gates Hollow, Bradford, April 

 18, 1897. D.A.B. (figured). Washington Co.: On wood, near Washington, 1892. A. 

 Linn & J. S. Simonton. Westmoreland Co.: T. P. James. (Porter's Catalogue). 



2. Thelia asprella Sullivant 



(Lesked asprella Bryologia Europaea 

 Plate XXXVIII 



In most respects quite similar to T. hirtella, but more glaucous-green: 

 densely interwoven into mats up to 1.5 mm thick; leaves bordered nearly all 

 around by somewhat longer cilia, and the papillae on the dorsal surface of the 

 leaf more or less branched or stellate: peristome-teeth longer with nodose 

 articulations; spores mature in early fall. 



In the same habitat as the last species and often mixed with it; ranging 

 from New England to Ontario and Minnesota and south to the Gulf States. 



Known from Bedford, Butler, Cameron, Centre, Clarion, Clearfield, Erie, Fayette, 

 McKean (Porter), Somerset, Washington, and Westmoreland counties. Specimen figured: 

 In oak woods, Presque Isle. Erie Co., May 8-9, 1906. O.E.J. 



3. Thelia Lescurii Sullivant 



Closely resembling T. asprella but with the stouter stems fasciculately 

 branched, whitish or light glaucous-green in color: leaves deltoid-ovate with a 

 shorter acumen than in T. asprella, not so distinctly ciliate-fimbriate; the pap- 

 illae usually stellately 3- or 4-lobed; the capsule relatively more slender and 

 longer and on a longer seta; the teeth shorter and only sub-nodosely articu- 

 late, the irmer membrane longer and with short segments; spores mature in fall. 



On flat rocks, ledges, or on dry, sandy soil; from New England to Mis 

 souri and the Gulf States. In eastern Pennsylvania and may occur in our 

 region. 



2. Myurella Bryologia Europaea 



Dioicous: slender, forming cushions or loose tufts, soft (stiff when dry), 

 light to bluish-green, dull to sub-lustrous: in thick tufts the stems are upright, in 

 loose tufts ascending, irregularly bushy-branched with small-leaved stolons, 

 basally bushy-radiculose; branches obtuse, sometimes apically flagelliform; 

 paraphyllia none; leaves 5-seriate, more or less appressed-imbricate, round- 



