296 HANDBOOK OF BRITISH MOSSES. 



6. G-. rostellatum, Schimp. ; leaves linear-lanceolate, erecto- 

 patent and curved, mucronate from the excurrent nerve, 

 minutely papillose, crisped when dry ; sporangium immersed, 

 elliptic; lid very persistent, at length deciduous, obliquely 

 rostrate. Hook, fy Wils. t. xxxviii. ; Eng. Bot. t. 2831. ; (Moug. 

 $ Nest. n. 903.) 



On dried beds of pools. North and south of England. 

 Bearing fruit in autumn and early spring. 



Slightly caespitose. Leaf-cells as in G. squarrosum, from 

 which it differs principally in its immersed fruitstalk. 



b. Spore-sac not adherent. 



7. G. tortile, Schwag. ; tufted, branches fastigiate ; leaves 

 crowded, slightly crisped when dry, oblongo-lanceolate, obtuse, 

 apiculate ; margin incurved ; nerve strong ; sporangium ellip- 

 tic; lid rostrate. Hook. Wils. t. xxxviii.; (Moug. fy Nest. 

 n. 1003.) 



On calcareous rocks. Derbyshire, Sussex, Cornwall. Bear- 

 ing fruit in spring. 



Forming irregular, dense tufts. Nerve of leaves strong, 

 reddish. 



Differs from the last in its stouter habit, wider leaves, 

 thicker nerve, thicker sporangium, wider mouth, beneath which 

 it is slightly constricted. Leaf-cells as in the last. 



108. SYSTEGIUM, Schimp. 



Sporangium immersed or subimmersed on a very short 

 fruitstalk, symmetrical ; lid persistent, but separating easily 

 from the ripe sporangium ; spores globose, rather small. 



1. S. crispum, 8 chimp. ; stem short, subdivided; leaves 

 linear-lanceolate, mucronate from the excurrent nerve, crisped 

 and curled when dry ; margin involute, minutely papillose 



