258 A MANUAL OF MOSSES 



On rotten logs and stumps and at the base of trees in 

 woods; Europe, and from New Brunswick to Minnesota and 

 south to Florida and Mexico. Common in our region. 



Allegheny : Keown, November 14, 1909, and Darling- 



ton Hollow, Sharpsburg, November 9, 

 1908. O. E. J. ; Wildwood Road Hollow, 

 November 19, 1908. O. E. J. and G. K. J. 



Blair : Burgoon's Gap. A. P. Garber. (Porter's 



Cataicigue) . 



Fayette : Meadow Run Valley, four miles south of 



Ohio Pyle, on stump, September 1-3, 1906. 

 O. E. J. and G. K. J. (Figured). ^ 



Huntingdon : T. C. Porter. (Porter's Catalogue). 



McKean : On decaying logs, Bolivar Run, Bradford, 



August 8, 1896, and Marilla Brook, Oc- 

 tober 22, 1896, also near Bradford. D. 

 A. B. 



2. Thuidium delioatulum [Linnseus] Mitten. 

 (Hypnuin delifatulum Linnaeus; H. tamariscinum Sullivant and 

 Lesquereux). 



(Plate XXXVI) 



The "Common Fern Moss." — Bright green above, darker 

 below, large, forming rather large and intricately woven mats, 

 when dry rather stiff and harsh : stems elongate, procumbent 

 or arched and alternately rooting, often reaching a length of 

 10 or 12 cm. ; the branching is twice or thrice pinnate, very 

 regular and fern-like ; stem-leaves triangular-ovate, somewhat 

 cordate, gradually acuminate, about 1 mm. long, erect-spread- 

 ing, appressed when dry, somewhat serrate and marginally 

 more or less recurved; leaf-cells unipapillate on both sides, 

 rather incrassate, the median quadrate-oblong to rhombic-oval 

 or rounded-quadrate, about .007 to .008 mm. across: costa 

 strong and ending in the acumen ; branch-leaves much smaller, 

 broadly ovate, acuminate, the apical cells with 2 to 4 papillae ; 

 perichsetial bracts ciliate on the margins : seta about 2 to 3 cm. 

 long, rather stiff, richly castaneous, somewhat dextrorse; cap- 

 sule large, the urn about 3.5 to 4 mm. long, strongly inclined 

 to horizontal, arcuate, narrowly oblong, yellowish to castane- 

 ous ; lid slenderly conic-rostrate, about 1.5 mm. long; annulus 

 narrow, usually 2-seriate; peristome large, reddish, the teeth 

 strongly and numerously trabeculate, often split at the liyaHne 

 and papillose apex, dorsally cross-striate below, the divisural 

 and lamellae distinct ; segments about as long as teeth, carinate- 

 ly split, papillose above; the 2 or 3 slender nodose cilia rising 

 from a basal membrane about one-third as high as the peris- 

 tome ; spores rather thin-walled, pale-castaneous. very slightly 

 roughened, about .014-.017 mm., mature in winter. 



