Jennings: Manual of Mosses — 2. Dicranaceae 53 



brown than the urn; calyptra cucullatc; exothecial cells rather incrassate, irregu- 

 larly elongate-hexagonal or rectangular-oblong, two or three rows at the rim 

 much smaller and darker; spores smooth, rather thin-walled, yellowish-pellucid, 

 mature in May or June. Quite variable. 



Cosmopolitan on burnt-over ground, roadsides, vacant lots, roofs, bare 

 clay soil, etc. 



Very common in cur region. Now known from Allegheny, Armstrong, Beaver, Bed- 

 ford, Butler. Cambria, Centre. Clearfield, Clinton. Crawford, Ene, Fayette, Liwrence, 

 McKean, Somerset, Washington, and Westmoreland counties. Specimen figured: Sand- 

 plain, Presque Isle, Ene Co., May 8-9, 1906. O.E.J. 



6. Seligeria Bryologia Europaea 



Autoicous: minute, gregarious, or cespitose, rupestral: stem simple or 

 branched at base, rarely with long sterile shoots; leaves in 3 to 5 series, the 

 lower minute and distant, the upper abruptly larger and canaliculate-subulate 

 from a concave lanceolate base; costa often stronger above the base; alar cells 

 not differentiated: seta mostly erect, but little longer than involucral leaves; 

 capsule globose-pyriform, smooth; collum distinct; annulus none; peristome 

 deeply inserted, or rarely none; when present, teeth broadly lanceolate, usually 

 entire, truncate or acute; operculum obliquely rostrate; calyptra cucullate. 



A widely distributed genus of about 20 species; 8 occurring in North 

 America; 2 in our region. 



Key to the Species 



A. Seta arcuate when moist; leaves with a long, acute, subulate acumination 



1. S. recurvata 



A. Seta erect when moist; leaves with a rather short, linear, sub-obtuse subulation 



2. S. calcarea 



1. Seligeria recurvata (Hedwig) Bryologia Europsa 



(S. setccea [Wulfen] Lindberg) 



Densely gregarious, dark green, very small: stems short, about 1 mm or 

 less, simple or forking; leaves up to 1.5 mm long, erect-spreading, flexuous, 

 with a long, canaliculate, acute subulation from a lance-ovate base, the margins 

 entire; costa long-excurrent, forming much of the subulation; basal leaf-cells 

 thin-walled, pellucid, irregular or rectangular, above becoming quadrate and 

 incrassate; perichajtial tubulose-sheathing at base, towards apex lance-subulate; 

 seta long, yellowish, arcuate when moist, but when old and dry often erect, 

 more or less flexuous; capsule oval to subglobose, erect, thin-walled, short- 

 necked, red-mouthed, turbinate when empty; exothecial cells lax; no annulus; 

 operculum about as long as urn (each about 0.4 mm), straight, subulate- 

 rostrate; peristome-teeth 16, lanceolate to linear, obtuse to acute, sometimes 

 irregularly bifid at apex, free, smooth, orange-pellucid, reflexed when dry. 



On rocks in shade. Europe, Asia and, in North America, in Ontario, 

 Pennsylvania, New York, New Jersey and in the Rocky Mountains. Occurs 

 on limestone rocks in eastern Pennsylvania and may occur in similar habitats 

 in central Pennsylvania. 



