288 HANDBOOK OF BRITISH MOSSES. 



On rocks and stones, especially those winch are arenaceous. 

 Not common. Scotland and north of England. Bearing 

 fruit in autumn. 



Monoicous ; extremely small, gregarious. Leaves lanceo- 

 lato-subulate, minutely toothed ; leaf-cells oblong, hexagonal, 

 rather lax, nearly uniform, very different from those of Seli- 

 geria ; sporangium symmetrical, truncate, ovate; ring none; 

 lid conical ; columella exserted when dry. 



102. SELIG-ERIA, Br. 8f Schimp. 



Sporangium roundish, wide-mouthed ; ring none ; veil small, 

 cucullate ; peristome single, of sixteen equidistant, lanceolate, 

 obtuse, entire teeth, sometimes perforated ; without any medial 

 line. Minute, nearly stemless, monoicous Mosses. 



1. S. pusilla, Br. fy Schimp. ; leaves lanceolate, subulate, 

 somewhat toothed in the middle; fruitstalk straight; teeth 

 remotely barred. Hook, fy Wils. t. xv. ; (Moug. fy Nest. n. 

 1005.) ' 



On nearly vertical rocks, especially those which are calca- 

 reous. Ireland and north of England. Bearing fruit in 

 spring. 



Gregarious, bright green. Leaves with a broad, excurrent, 

 predominant nerve ; leaf-cells oblong, rectangular, often con- 

 fined to the margin, all the rest being occupied by the nerve. 



2. S. calcarea, Br. Schimp.; leaves rather short, lanceolate 

 from an oblong base, blunt (or subacute) ; nerve thick ; fruit- 

 stalk rather thick; lid short; teeth densely barred. Hook. 

 mis. t. xv. ; Eng. Bot. t. 191. ; (Plate 24, fig. 2.) 



On the steep sides of chalk pits. Bearing fruit in spring. 



Distinguished from the last by its broader leaves, thicker 

 nerve, thicker fruitstalk, shorter beak, and broader, more 

 closely articulated teeth. Leaf-cells much as in the last. 



