66 American Midland Naturalist Monograph No. 6 



capsule cylindric, 1.5 to 2 mm long; peristome-teeth deep red, not deeply in- 

 serted, split about to the middle, papillose-striate at base, sub-hyaline above; 

 no annulus; lid subulate-rostrate, shorter than the urn, straight or curved; 

 calyptra cucullate, rostrate, covering only the upper third of urn; spores small, 

 mature in summer: dioicous, antheridia terminal. 



At the southern border of our cegion, on sandstone boulder along wooded path, Tibbs 

 Run, Monongalia County, West Virginia. C. F. Millspaugh. Both Williams and Grout 

 regard this as the same as D. denudatum. 



3. Dicranodontium Millspaughii E. G. Britton 



Silky, cespitose, yellowish-green; stems rufous-tomentose at base, up to 3 

 cm long; leaves erect-spreading to secund, up to 5 mm long, from a broad, 

 concave, non-auriculate base narrowly tubulose-subulate; costa strong, excurrent 

 into a linear tip, dentate marginally and dorsally; alar leaf-cells large, hyaline, 

 mainly quadrate to shortly rectangular, extending to the costa, above quickly 

 smaller, incrassate, tending to fusiform-prosenchymatous towards the margin, 

 shorter to quadrate in the upper part of the lamina: seta cygneous, erect when 

 old, 5-8 mm long, stout; capsule pyriform-cylindric, smooth, the urn about 1 

 mm, long; peristome-teeth deeply inserted, red, confluent at base, split to the 

 middle or perforate to the base, papillose-striolate below, paler above; no 

 annulus but the rim of the urn dark colored; lid about as long as the urn 

 (1 mm), straight, subulate-rostrate; spores maturing in summer; dioicous. 



At the southern border of our region on sandstone rock in deep woods along Tibbs 

 Run, Monongalia County, West Virginia. C. F. Millspaugh. Both Williams and Grout 

 regard this the same as D. denudatum. 



Family 3. Leucobryaceae 



Dioicous, rarely autoicous; densely cespitose and mere or less spongy like 

 Sphagnum, whitish to glaucous-green: stem without central strand, scarcely 

 radiculose; leaves pluriseriate, close, quite uniform in size; costa very broad, 

 constituting most of the leaf, sometimes narrow with a stereid-bundle, com- 

 posed of two kinds of cells, the outer large and parenchymatous with per- 

 forated inner walls, the inner smaller and chlorophyllose, the lamina hyaline, 

 usually very narrow and mainly basal: seta single, erect; capsule erect and 

 symmetric or inclined, unsymmetric and strumose; annulus none; peristome 

 usually inserted below the edge of the urn, the teeth m.ostly 16, sometimes only 

 8, lanceolate, articulate, entire or cleft to the middle; operculum conic, ros- 

 trate; calyptra cucullate or sometimes mitrate. 



With the exception of the genus Leucobryiim the species of this family are 

 mostly tropical or sub-tropical in their distribution and occur mainly on 

 trees. In our region there occurs only the following genus: 



1. Leucobryum Hampe 

 Dioicous: thickly to loosely cespitose; whitish or glaucous green, mostly 

 lustrous: leaves erect, when dry appressed and brittle, sometimes spiral, or 

 falcate, or squarrose-spreading, from an ovate base lanceolate- to subulate- 

 acuminate, canaliculate or sometimes almost tubulose above; costa flat, the 



