184 American Midland Naturalist Monograph No. 6 



1. Leucodon brachypus Bridel 



Plate XXXV 



Moderately robust, brownish to light green, loosely tutted: stems usually 

 at least 5-6 cm long, with rather numerous secondary simple or branched divi- 

 sions; leaves about 2 mm long, ovate, bluntly acute to short-acuminate, ob- 

 scurely more or less secund, usually plicate with two folds, entire to serrulate 

 above; costa none; median leaf-cells linear-fusiform and castaneous pellucid at 

 base, the interior median rhombic, about 5-8.1, grading to oval at the apex, 

 the marginal basal rounded-quadrate to transversely oblong, all cells incras- 

 cate; penchaetial leaves loosely appressed-sheathing, non-plicate, the inner 

 surpassing the capsule; seta about 2-4 mm long, wrapped in the perichaetial 

 leaves; capsule oval-oblong, about 1.2-2 mm long, about 2:1 castaneous, small- 

 mouthed, dark-rimmed; lid conic, obliquely short-rostrate; peristome-teeth 

 rather broad, irregular, pale to whitish, papillose, often bifid at apex, the inner 

 peristome very thin, narrow, and without segments or cilia; spores mature in 

 winter or late fall, pale, rather thin-walled, granular. 



On trees and rocks in hilly or mountainous regions; from Nova Scotia to 

 Kansas and south to the Gulf States. 



Cambria Co.: Cresson. T. C. Porter and T. P. James. (Porter's Catalogue). Craw- 

 ford Co.: On bark at base of Fraxinus nigra, near Linesville, June 11-12, 1907. O.E.J. 

 McKean Co.: Quintuple, November 11, 1893, (approaching L. sciuroides in arumina- 

 tion of leaf-apex) and Langmade, near Bradford, August 11, 1895. D.A.B. (figured). 

 Washington Co.: Linn and Simonton. (Porter's Catalogue). 



2. Leucodon julaceus [Linnaeus] Sullivant 



(Hypnum julaceum Linnaeus; Pterigynandrum julaceum Hedwig) 



Plate XXXVI 



Resembling the preceding in habit but with shorter secondary stems and 

 distinctly terete branches, which are julaceous when dry: leaves crowded, closely 

 appressed-imbricate when dry, scarcely secund, ovate-elliptic, abruptly short- 

 acuminate, entire or slightly serrulate at apex, the margins often recurved, 

 blade concave, scarcely plicate, the base rounded and sub-clasping, mammillose 

 at back of apex; leaf-cells mainly as described for the genus, but the upper 

 much shorter and broader than in the other species, in the median upper third 

 rhombic-oblong, incrassate^ about 2-3:1, seriate; the marginal rounded-hexag- 

 onal but towards the base usually densely transversely oblong-hexagonal, the 

 basal median linear-vermicular and much incrassate, those above becoming 

 shorter; costa none; perichaetial leaves linear-oblong, filiform-acuminate, reach- 

 ing well up to the capsule: seta slender, partly exserted; capsule turgid-oval, 

 castaneous, about 0.5-0.7 x 1 mm; annulus none; lid obliquely short-rostrate, 

 about half as long as the urn; peristome closely similar to that of L. brachypus, 

 the teeth apically bifid; spores mature in fall. 



In woods on tree-trunks, often mixed with other mosses, from New Eng- 

 land to Minnesota and south to Florida and Texas. 



As yet known only from the southern third of western Pennsylvania. Ai LEGHENY 

 Co.: On base of white oak tree. Library, Apnl 29, 1909. O.E.J, (figured). Bedford 



