Jennings: Manual of Mosses — 14. Bryaceae 123 



Key to the Species* 



A. Upper leaf-cells ver>i narrow: inner peristome with a low basal membrane, usually 



complete narrow segments, and cilia various, often rudimentary or none B 



A. Leaf-cells linear to moderately narrow: basal membrane comprising one-third to one- 

 half the height of the inner peristome; segments split, cilia well developed C 



K. Paroicous; capsule long and slender with a long slender collum 1. P. elongata 



B. Polyoicous; capsule oblong to pyriform with a rather short collum 2. P. cruact 



C. Paroicous; not bearing gemmae: costa hardly reaching the serrate apex D 



C. Dioicous; often bearing gemmae: costa incomplete or percurrent E 



D. Cilia two, not sub-appendiculate. articulate 3. P. nutans 



D. Cilia three, distmctly sub-appendiculate 3a. P. nutans var. triciHata 



E. Costa not reaching apex except irj uppermost leaves; capsule small and very short; 



stem not reddish 4. P. pulchella 



E.Costa percurrent: capsule larger and elongate-pyriform; stem reddish below 



5. P. annotina 



1. POHLIA ELONGATA Hedwig 

 ( Webera elongMa Schwaegrichen ) 



Gregarious to respitose, bright pale green: stems erect, up to 2 cm high, 

 branching towards base; leaves crowded and larger in the comal tufts, lanceo- 

 late, erect-spreading, thin, the margin recurved below, the apex gradually 

 narrowed, serrate; costa brownish, vanishing below or at the apex; leaf-cells 

 narrow, linear-rhomboidal and vermicular above, hexagonal-rcctangulsr below: 

 seta long, slender, 2-4.5 cm high; capsule sub-erect to horizontal, narrowly 

 elliptic, pale, 2-5.5 mm long, the neck slender and longer than the rest of th; 

 capsule, when dry and empty the capsule constricted below the mouth; oper- 

 culum conic-acuminate or acutely rostellate; outer peristome yellowish, the 

 inner with a basal membrane about one-third as high as the teeth; cilia two. 

 more or less weli-devcloped but always short ?.nd never appendiculate; paroi- 

 cous; antheridia in pairs in axils of upper leaves: mature in August. 



On earth and among rocks, in crevices, etc., where moist, usually in the 

 mountains. Europe, northern Africa, Asia, North America from G;eenland 

 to the northern United States and southwards, in the mountains, west to 

 British Columbia. Rare in our range. 



We have seen no specimens from Pennsylvania, but it is reported as follows: Mc- 

 Kean Co.: Bradford. (Porter's Catalogue). 



2. PoHLlA CRUDA [Linnaeus] Lindberg 

 {Webera cruda Bruch) 

 Robust, up to 6 or 7 cm high, glaucous green and shining above, brownish 

 below: st.:ms red, simple, cespitosc; the leaves below ovate, becoming linear- 

 lanceolate in the comal tuft, erect-spreading, serrate towards che moderately 

 acute apex, margin plane, rather rigid; costa reddish at base, not re?_ching apex; 

 leaf-cells linear-prosenchymatous above, larger and rectangular at base, where 



* Pohlia carnea (L.) Lindberg has now been found in New York, Ohio, Illinois, and 

 Iowa. It has widely hexagonal-rhomboid, thin-walled cells up to .018-. 025 x .100 mm, 

 narrowed towards edge; no annulus; capsule dark red, very short (1.5 mm), oval; seta 

 thickened at top. The leaves are small and narrowly lanceolate. 



