•19 



ITdl. On rocks mikI stones in • itween tide-marks, and 



at a greater depth. PerenniaL Winter. Common. 

 Cladostephus spangiosus, the earliest described speci 

 the genus, differs from C. verticillatus, more by its smaller 

 sue, more clumsy and Bomewhal Bezuoua branches, and 

 more closely imbricated ramelli, than by any more definite 

 character. The distinction in the ramelli, aoticed in the 

 Bpecific phrase by most authors, is not constant, for thesi 

 often forked in the present Bpecies, though more usually 

 simple. The colour is darker than that <>f ('. verticillatus, 

 and, on the whole, the present is a much less elegant plant. 

 ('. gpongiosus is a very common plant throughout th 

 lantic and Mediterranean Seas. 



WXIII. SPHACELARIA. 



11. Filicina {The Tern-like Sphacelaria) \ frond shaggy 



base, slender, irregularly branched ; branches lanceolate, 

 erecto-patent, bi-tri-pinnate ; pinnae alternate, erect : pin- 

 nules niultitid. lanceolate: axils all very aeute and narrow, 

 Ag. Syst. p. ice. Atlas, PL XVII. Fig. 72. 



Sphacelaria hypnoides, Gfrev. S. Bimpliciuscula, Ag. Halopteris 

 filicina, Kiitz. Ceramium filicinum, (iralrJ. 



Hob. Southern shores of England. On rocks and nullipor 

 low-water mark, and at the roots of Laminaria, etc. \ 

 rare. Perennial. Fruiting in winter. 



There are few more beautiful plants among the filiform 



Algffi of our coasts, and not many more rare than this, which, 

 though found in several distant Localities, is nowhere abun- 

 dant in Britain. It is indeed a species of the south of Ei - 

 rope which finds its northern limit in our seas, where it 

 docs not reach much more than half the size that it attains 

 in tin' Mediterranean. Specimens from the shores of Italv 

 are nearly as large and bushy as S. scoparia, hut much 

 more slender in all their parts. Our British individuals. 

 m Jersey, are feeble, and have a different 

 aspect. Bet ween the w inter and summer states of th 

 cies, the differences are bo great, that Agardh formerly con- 

 stituted them two Bpecies, his S. simpliciuscula, which has 

 its pinnules Bubsimple, being the w inter state of S. filicina, 



73. Sertularia I >nd >li^lit lv 



sha'_ r L r y at tli.- base, weak and .-lender, irregularly branched : 



branches somewhat lanceolate or linear, horizontally p 



tripinnatc; pinna- alternate, dnaricale ■. pinnules Jerj pateni , 



E 



