254 CRYPTOGAMIA 



nearly a foot in length, are simple or sparingly branched ; 

 the branchlets spiniform, irregular, patent, tapered. Does 

 not adhere in the slightest degree to paper. 



7. C. rivularis, darkish green ; filaments unbranched, very long, 

 slender, clustered and twisted ; joints even, rather longer than 

 broad Eng. Bot. t. 1654. DILLW. Conf. t. 39. LIGHTF. Scot. 

 976. HOOK. Scot. ii. 82. 



Hob, Slow streams, not uncommon. 



" C. rivularis, grows in very compact, silky, slender masses, 

 of a dark green colour, frequently carried out to the length 

 of 2 or 3 feet, and twisted by the action of the stream," 



DlLLWYN. 



8. C. zonata, bright shining green ; filaments unbranched, slen- 

 der, slippery ; joints even, rather broader than long DILLW. 

 Syn. 41. Conf. lucens, Eng. Bot. t. 1655. DILLW. Conf. t. 47. 



Hob. In rapid streamlets, or on the front of rocks over 

 which water falls, near Berwick. 



9. C. sordida, yellowish-green, soft ; filaments unbranched, very 

 slender, entangled in dense masses ; joints rather longer than 

 broad, pellucid, as well as their partitions Eng. Bot. t, 2303. 

 DILLW. Syn. 43. t. 60. 



Hab. In ponds in spring. 



The filaments are so fine, that, even when considerably mag- 

 nified, they do not seem thicker than common sewing 

 thread. They form a closely entangled mass, which at 

 first floats round decayed straws and leaves, but ultimate- 

 ly forms large floating masses of a dirty yellow-green, very 

 soft, but not lubricous. 



* * Filaments branched' 



10. C. riparia, yellowish-green, matted, not lubricous ; filaments 

 capillary, long, sparingly branched ; branches mostly short and 

 simple, very patent ; joints rather obscure, scarcely twice their 

 diameter in length. DILLW. Syn. 69. t. E. Eng. Bot. t. 2100. 

 C. obtusangula, LYNGB. Hydroph. Dan. 159. t. 55. 



Hab. On rocks, in wide patches, at the highest water mark, 

 abundant in this neighbourhood. 



