202 American Midland Naturalist Monograph No. 6 



main portion of the leaf: seta short, about 7-10 mm long, erect, sinistrorse, 

 richly castaneous; capsule about 2 mm long, oval-oblong, about 2.5:1, erect, 

 symmetric castaneous; lid conic, obliquely rostrate, about one-half to three- 

 fifths as long as the urn; teeth small, lance-linear, the divisural and dorsal 

 lamellae indistinct, the teeth with about 15 to 18 nodose articulations, pale, 

 papillose; segments about as long as the teeth, linear, rising from a basal mem- 

 brane about one-third as high as the teeth, the cilia solitary and rudimentary 

 or none; exothecial cells medium-walled, oblong-rectangular to oblong-he.xag- 

 onal, becoming quadrate above, about two rows at the rim much smaller and 

 heavily castaneus-incrassate; spores mature in fall, thin-walled, nearly smooth, 

 slightly brownish, about .010 mm in diameter. 



In moist places, on rocks or more usually on the bases of trees; Europe, 

 Asia, and from Canada to the Gulf States and to the West. 



Very common in our region, especially on the bases of white oak trees. Known from 

 collections from the following counties: Allegheny, Beaver, Bedford, Butler, Campron, 

 Centre, Clarion, Crawford, Erie, Fayette, Greene, Huntingdon, McKean, Somerset, Wash- 

 ington, and Westmoreland. Figured from specimens collected four miles up the valley of 

 Meadow Run, Ohio Pyle, Fayette Co., May 30-31, 1908, and Sept. 1-3, 1906. O.E.J. 



5. Lindbergia Kindberg 

 (Fabroleskea Grout) 



Autoicous: rather softly and loosely cespitose, bright to brownish-green, 

 dull: stem elongate, creeping, radiculose, densely-leaved, branched with 

 elongate mostly irregularly pinnate branches; branchlets short or unequal in 

 length, obtuse; dry leaves imbricate, when moist spreading to almost squarrose- 

 spreading, somewhat concave, more or less decurrent, ovate to lance-ovate, 

 abruptly subulate-acuminate, non-plicate, margins entire or rarely indistinctly 

 apically serrulate; costa strong, incomplete; median leaf-cells lax, round-oval 

 or rhombic hexagonal, smooth, or unipapillose, the marginal smaller and quad- 

 rate or transversely broader, the basal marginal in many rows quadrate to trans- 

 versely broader; inner perichaetial larger, thin, erect, from a sheathing base 

 subulate-acuminate, entire or serrulate; costa shorter: seta 5-10 mm long, 

 straight, thin, red, smooth; capsule erect, symmetric, oval-oblong, rarely slightly 

 curved, brown, small-mouthed and short-necked; annulus present or none; 

 peristome deeply inserted, teeth lanceolate, obtuse, basally confluent, pale to 

 yellow, non-striate, more or less papillose, divisural zigzag, low-trabeculate; 

 inner peristome papillose with a very low basal membrane, no segments, no 

 cilia; lid conic-obtuse; calyptra cucullate; spores .025-. 030 mm. 



As here limited the genus consists of 13 species, occurring on tree- trunks 

 in the Northern Hemisphere; three species in North America; one species 

 in our region. 



1. Lindbergia Austini (Sullivant) Brotherus 



(Fdhroleskea AuUini Grout; Leskea Austini Sullivant; Lindbergia 

 brachyptera var. Austini (Sullivant) Grout) 



Medium size, intricately matted; stems irregularly divided, the branches 

 usually quite unequal; leaves spreading to more or less squarrose when moist- 



