OF WESTERN PENNSYLVANIA. 59 



A widely distributed genus of about 15 species; 4 occur- 

 ring in North America ; 2 in our region. 



Key to the Species. 



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

 acumiiiation. I. 5*. recurvata. 



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

 obtuse subulation. 2. S. calcarea. 



1. Seligeria recurvata (Hedwig) Bryologia Europsea. 



{S. setacea [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 be- 

 coming quadrate and incrassate ; perichastial 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, and in the Rocky Mountains. Oc- 

 curs on limestone rocks in eastern Pennsylvania and may 

 occur in similar habitats in central Pennsylvania. 



2. Seligeria calcarea [Dickson] Bryologia Europaea. 



Densely gregarious, dull, dark green : stems short, less 

 than 1 mm., simple; leaves short, less than 1 mm., the lower 

 lanceolate, the upper from an oblong concave base abruptly 

 narrowed to a shorter, linear, obtuse or sub-obtuse, entire 

 subulation; costa rather flat, indistinct below, above obscure 

 and filling the whole apex ; basal leaf-cells shortly rectangular, 

 pellucid, thin-walled, above becoming irregularly quadrate to 

 rounded or hexagonal, obscure, chlorophyllose, incrassate : seta 

 straight, erect ; capsule erect, oval-pyriform, turbinate when dry 

 and empty, brownish ; peristome-teeth 16, broadly lanceolate, 

 rather densely articulate, flat, entire, smooth, orange-pellucid, 

 reflexed when dry; lid subulate-rostrate but considerably 

 shorter than the urn ; spores mature in spring or early summer. 



On calcareous or chalky rocks. Europe and, in North 

 America, in Vermont, Ontario, Pennsylvania, and Lake Winni- 

 peg. Rare. In our region reported but once. 



Huntingdon: Warrior's Ridge. Pori^r. (Porter's Catalogue). 



