108 American Midland Naturalist Monograph No. 6 



Key to the Species 



A. Rupwstral; leaves not crispate when dry 1. (J. americana 



A. Arboreal: leaves more or less crispate when dry B 



B. Capsule smooth, slightly plicate below the distinctly narrowed mouth and at the 



neck 2. U. Ludwigii 



B. Capsule wide-mouthed, distinctly plicate c 



C. Capsule constricted below the mouth, gradually narrowed at base to the long neck: 



teeth confluent 3. U. crispa 



C. Capsule not distinctly constricted below the mouth, abruptly narrowed to the shorter 



neck; teeth separated at apex 3a. U. crispa var minus 



I. Ulota AMERICANA [Beauvois] Limpricht, not Mitten 



(U. Hutchinsiae Hammar) 



Plate XIX 



Rather loosely cespitose, blackish with greenish tips, about 1 cm high, or 

 less: stems creeping, sparingly branched with erect branches, when dry the 

 leaves appressed and straight; leaves often with hair-like paraphyllia at base, 

 lance-ovate or linear-lanceolate from an ovate base, carinate, concave at least 

 below, margins usually revolute in lower half, costa and base of lamina pellucid- 

 castaneous, apex sub-acute; costa strong, sometimes percurrent; apical and 

 median leaf-cells incrassate, papillose, rounded-quadrate, rather opaque, the 

 basal marginal rounded-quadrate to rounded-rectangular, hyaline, towards the 

 costa becoming linear, more or less vermicular and occasionally anastomosing, 

 much incrassate and markedly pellucid-castaneous : seta about 2 mm long, 

 smooth, with a distinct smooth volva at base; capsule yellowish, cylindric- 

 oblong, basally tapering, when dry 8-costate and with more or less distinct 

 intermediate costae at mouth, the neck and seta decidedly dextrorse; stomata 

 immersed; peristome-teeth 16, more or less paired, articulate, granular, when 

 dry strongly reflexed, segments 8, about one-half as high, bi-seriate below; 

 calyptra yellowish, mitrate, plicate, incised-Iobate at base, densely clothed with 

 erect to spreading slender hairs; lid conic-rostrate; spores globose, papillose, 

 incrassate, about .016-.018 mm, mature in spring. 



On non-calcareous rocks, mainly in hilly or mountainous regions; Europe, 

 Asia, and from New Brunswick to Georgia and west to the Rocky Mountains. 



Common in our region. Cambria Co.: Cresson. T. P. James. (Porter's Catalogue). 

 Centre Co.: Dry rocks at top of Bald Eagle Mt., near Mattemville, July 14, 1909. 

 O.E.J. Fayette Co.: On rocks in bed of Youghiogheny River at Ohio Pyle, Septem- 

 ber 1-3, 1906. O.E.J, and G.K.J. Huntingdon Co.: T. C. Porter. (Porter Cata- 

 logue). McKean Co.: On rocks, Rutherford, May 13, 1898. D.A.B. Somerset 

 Co.: On dry, crumbling shale, Ursina, May 12, 1905. O.E.J, (figured). 



2. Ulota Ludwigii (Bridel) Bridel 



{Weissia coarctata Lindberg) 



Plate XIX 



Loosely cespitose, yellowish green: stems more or less creeping with erect 



shoots often 1 cm high, usually shorter, somewhat branched below; leaves 



erect-spreading but slightly twisted when dry, lance-ovate to lanceolate, concave 



at base, often carinate-concave in upper third, acuminate above but the extreme 



