248 HANDBOOK OF BRITISH MOSSES. 



ligulate or linear ; nerve reaching to the tip ; apex subcucul- 

 late, rather blunt; sporangium subcylindrical, spirally striated; 

 peristome double. — Hook, fy Wils. t. xiii. ; Eng. Bot. t. 2163. ; 

 (Moug. $ Nest. n. 506.) 



On rocks, stones, and the mortar of walls. Scotland, York- 

 shire, and Derbyshire. Bearing fruit late in summer. 



Stems 1-2 inches long; leaves blunt; margin minutely 

 crenulate ; nerve red ; perichsetial leaves narrowly lanceolate 

 from an oblong concave base; veil at first appendiculate ; 

 sporangium with about eight spiral furrows ; ring broad ; 

 teeth of outer peristome sixteen, inner of as many cilia alter- 

 nating with them ; spores very minute, green. 



Oeder XXVII. RIPARIACEI, Br. & Schimp. 



Sporangium immersed or more or less exserted ; lid conico- 

 rostrate, spiral ; peristome consisting of thirty-two teeth, con- 

 nected together by anastomosing processes or of an irregularly 

 fissured, sometimes rudimentary membrane ; top of the colu- 

 mella dilated and connected with the peristome. Large, hand- 

 some, aquatic Mosses. 



80. CINCLIDOTTTS, Br. fy Schimp. 



Sporangium ovate or oval, even, with thick walls; veil 

 smooth, conical, cucullate ; peristome simple, sometimes rudi- 

 mentary, of thirty-two teeth rising from a common mem- 

 branous base, connected below by anastomosing processes, and 

 twisted round the columella. 



1. C. riparius, Br. 8f Schimp.; dioicous; branches fascicu- 

 late ; leaves erecto-patent, elongated, Ungulate, obtuse, shortly 

 mucronate from the excurrent nerve; fruitstalk short and 

 thick; sporangium exserted, oblong; lid obliquely rostrate; 



