TRICHOSTOME^I. 131 



4. D. majus. Turn. (Greater Fork Moss.) 

 Pinner. 



LEUCOBRYUM. (White Fork Moss.} 



I. L. glaucum. B. and S. (White Fork Moss.) 

 Harrow Weald Common. 



CERATODON. (Horn-tooth Moss.) 



I. C. purpureus. Brid. (Purple Horn-tooth Moss.) 

 Harrow Weald. 



SUB-ORDER II. POTTIE^E. (POTTIA DIVISION.) 



POTTIA. 



I. P. truncata. B. and S. (Truncated Pottia.) 

 Harrow. 



SUB-ORDER III. TKICHOSTOME/E. (FRINGE Moss DIVISION.) 



DIDYMODON. (Twin-tooth Moss.) 



I. D. rubellus. B. and S. (Purple Twin-tooth Moss.) 

 Harrow and Pinner. 



TORTULA. (Screw Moss.) 



1. T. unguiculata. Hedw. (Bird's-claw Screw Moss.) 

 Harrow Weald. 



2. T. fallax. Hedw. (Fallacious Screw Moss.) 

 Ruislip. 



3. T. muralis. Hedw. (Wall Screw Moss.) 

 Pinner; Harrow. 



