CONFERVACEiE. 275 



Chsetomorpha implexa. The interwoven Cheeto- 

 morpha. 



Threads very slender, limp, curled, intimately interwoven, 

 growing in flattish masses on rocks and sea-weeds ; cells 

 rather longer than they are broad. 



This species was also formerly a Conferva. It is of a 

 bright grass-green colour and soft texture. 



Chsetomorpha arenicola. The sand-inhabiting 

 Chsetomorpha. 



" Threads soft, simple, extremely fine, matted, somewhat 

 crisp, at first uniform pale-green, at length distinctly jointed; 

 articulations once and a half as long as broad, dotted • in- 

 terstices pellucid." — Berkeley. 



This plant appears to be but little known, and is not 

 referred to by Kiitzing. The above is Mr. Berkeley's 

 description of it, and he further speaks of it as " creep- 

 ing on the sandy margins of pools in a salt-marsh, 

 periodically flooded, forming a thin, soft, delicate, 

 crisped web, of a pale yellow-green." 



Chsetomorpha arenosa. The sand Chsetomorpha. 



Threads slender, nearly straight, rigid, harsh, about six 

 inches long ; cells about four times the length of their 

 diameter. 



Quoting from Captain Carmichael, Dr. Harvey writes : 

 — " This species occurs in fleeces a yard or more in 

 extent, and of a peculiar structure. They consist of 

 several thin layers, placed over each other, but so slightly 

 connected that they may be separated like folds of gauze, 



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