126 American Midland Naturalist Monograph No. 6 



conic-apiculate to mammillate; annulus revoluble; peristome rather short, teeth 

 Hnear-lanceolate, yellowish-pellucid, abruptly narrowed above the middle to a 

 sub-hyaline papillose apex, divisural and lamellae present, trabeculae strong, 

 often a few connected by oblique or vertical bars; segments of inner peristome 

 a little shorter than teeth, carinately split and gaping, cilia usually two, some- 

 times one, articulate, shorter than segments; basal membrane one-third the 

 height of teeth; spores minutely roughened, about .015-. 018 mm, mature in 

 May: dioicous. 



On wet clay or sandy soil, Eastern Canada to District of Columbia, Penn- 

 sylvania and Michigan. 



Probably not rare in our region. Allegheny Co.: Power's Run, May 7, 1905. 

 O.E.J. McKean Co.: Quintuple, May 7, 1896. D.A.B. Westmoreland Co.: On 

 damp clay with Pogonotum, slope of Chestnut Ridge, Hillside, May 22, 1909. O.E.J, 

 (figured). 



5. PoHLiA annotina (Hedwig) Loeske* 



{Webera annotina Bruch) 



Loosely cespitose, light green: stems short, 1-2 cm, branching with slender 

 stiff innovations from the base; leaves below small, lanceolate, non-decurrent, 

 the upper longer, narrow-lanceolate, acuminate, margins somewhat recurved, 

 serrulate at apex; costa nearly or quite percurrent, often reddish at base; leaf- 

 cells rather thick-walled, narrowly rhomboid, small: seta red, flexuous: capsule 

 small, about 2 mm long, castaneous, the neck about as long as the rest of 

 capsule, tapering, the whole capsule oval-pyriform, inclined to horizontal; 

 annulus broad, revoluble; operculum conic-apiculate; mouth wide; peristome- 

 tceth yellowish, segments widely carinately gaping, cilia in pairs, articulate; 

 exothecial cells more or less collenchymatous: the sterile stems bearing in the 

 axils of most of the leaves greenish, sub-sessile, clustered, ovate to ovoid 

 gemmae with short non-twisted points: dioicous. 



Moist, sandy soil, especially among rocks in mountains. Europe, Algeria, 

 Asia, and, in North America, from Greenland to British Columbia and south 

 to New England, Pennsylvania, and Kansas. 



Rare in our region. Beaver Co.: Lesquereux. (Porter's Catalogue). 



3. Mniobryum (Schimper, ex parte) Limpricht 



Dioicous, rarely polyoicous: weak to robust, loosely cespitose in brownish 

 to whitish-green tufts, or gregarious: stems erect, red, radiculose at base; leaves 

 erect to erect-spreading, the upper lancolate to lance-linear, the apex acute and 

 distantly serrulate; costa mostly incomplete; cells lax and thin-walled; seta 

 elongate, when dry sinistrorse, more or less hooked or curved at the top; 

 capsule more or less pendent, usually short-pyriform, wide-mouthed, almost 

 turbinate, exothecial cells mostly hexagonal and often broader than high; 

 annulus none in our species; peristomes equal in length; teeth lanceolate, finely 



* Grout, in the Moss Flora of North America pointf. o it thnt Pohlia proligera Lind- 

 berg is more northern. The moss of our region formerly referred to that :pecies is P 

 annotina. 



