BH0D0MELA* I 73 



11G. Carmichaeliana (CanrnchaeVs PoUj9vphonid)\ Arm inar- 

 ticulate, percurrent, flexuous, rigid, set throughout with 

 lateral, alternate, inarticulate, divaricating branches; ramuli 

 scattered, jrerj patent, irregularly forked, articulate ; articu- 

 lations as long as broad, three-tubed, Harv. in Hook. Br. 

 Ft. >-. 2. p. 328. I \ ■-. PL \\\ 1 Pig, lis.) 

 Polysiphonia divaricata, Carm. 



JI(if>. Appin. Parasitical on Desmarestia aculeata. Very rare. 

 No one bu1 Carmichael his met with this plant, to my 

 knowledge, ami he only found it once. Its characters are 

 s.» peculiar that I formerly considered myself justified in 

 ag it a specific name How tar J acted wisely may 

 be questioned. At any rate, as it lias borne a name in 

 British works for many years, it is right that it Bhouldnow 

 he figured, that persons visiting the western Bhores of Scot- 

 land may look out tor it. Rigid and spiny as it looks, I. 

 have sometimes thought that it may be only an extravagant 

 form of Pol. fibrillosa. The specimen is preserved in the 

 herbarium of Sir W. J. Hooker. 



117. fibrillosa {The fibrillose Polysiphonia) \ pale straw- colour 

 or brownish : steins inarticulate, opaque, with sinuous wins, 

 robust, alternately branched ; branches spreading, resem- 

 bling the stem, but Less opaque, articulated towards the 

 apiees, Bubshnple, thickly set with very slender, articulated, 

 finely divided, short ramuli, whose tips arc copiously librilli- 

 ferous ; articulations of the ramuli rather Longer than broad, 

 2-3-striate ; Biphons four, in the stem Burrounded by a thick 

 wall of small cells ; capsules broadly ovate : tetraspores Large, 

 in distorted terminal ramuli, Gfrt d. ; Ham), in Hook. Br. 

 PL v. 2.p. 334 (Atlas, PL \\\ 111. Fig. 123.) 

 Hutchinsia fibrillosa, Ag. IL. Lubrica, Ag. II. pilosa, Nacc. 



Conferva fibrillosa, Dilho. 

 Huh. Atlantic shores of Britain. On rocks and stones, and on 

 Alg®, chiefly in clear, sunny pools Left by the falling tide. 

 Annual. Summer. 

 A common plant, subject to many variations iii form, hut 

 generally recognized by its somewhat clumsy, unjointed 

 stems, and Bhort, Boft, and gelatinous ramuli copiously 

 fibrillose at the tips. It is most nearly related to P. 

 lacea, with which alone can it well be confounded, and 

 from which it chiefly differs in its shorter and less multifid 

 ramuli, duller colour, and shorter articulations j hut there 

 are specimens occasionally found which seem almost to 



connect these two her. 



