Diclyusipht :n.\ 



ALGiE INARTICULATE. 279 



Rocks and stones in the sen, principally on the south coast of Eng- 

 land ; Sussex, Falmouth, Dawlish. Meadfoot and Sidmouth, Mrs. 

 Griffiths. Cromer, Mr. Turner. Near Belfast, Dr. Drum mond. Firth of 

 Forth, Dr. Grcvillc. © . Summer. 



3. P. tenuissima, Grev. (delicate Punctarict); frond sublinear 

 very thin transparent. — Grev. Alg. Brit. p. 54. — Zo?iaria? 



tenuissima, Ag. Syst. Alg. 268 Zonaria? plantaginca, var. tenuior, 



Ag. Sp. Alg.v. 1. p. 138. — Ulva plantaginea, var. tenuior, Lyngb. 

 Hydroph. Dan. p. 31. t. 6. 



Parasitic on Zostera marina, frequent on the coasts of the Isle ot 

 Bute, Dr. Greville. Appin, Captain Carmichael. — " Two to 8 inches in 

 length. Substance exceedingly thin and transparent, highly and 

 beautifully reticulated, slightly lubricous. Fructification unknown." 

 Grev, 



16. Striaria. Grev. Striaria. 



Frond filiform, tubular, continuous, membranaceous, branch- 

 ed. Root naked and scutate. Fructification; groupes of round- 

 ish seeds, forming- transverse lines. Grev. Alg. Brit. p. 54. t. 9. 

 — Named from the transversely striated appearance, caused by 

 the lines of fructification. " It is distinguished from the preceding 

 Genus, by its tubular or branched frond, and by the uniformly 

 transverse disposition of the groupes of seeds. From the fol- 

 lowing it differs in the last named character and in the more 

 highly reticulated structure." 



1. S. attenudta, Grey, (attenuated Striaria). Grev. Crypt. Fl. 

 ( Synopsis,) p. 44. Alg. Brit. p. 55. t. 9. — Carmichaelia at- 

 tenuata. Grev. Crypt. Fl. t. 288. 



In the sea, on various Algae; Appin, Capt. Carmichael. Shores of Bute, 

 Dr. Greville. Belfast Lough,. Dr. Drummond. ©. Summer. — "Frond 

 :i — 12 inches in height, less than a line in diameter, much branched, the 

 branches elongated, attenuated at both extremities, mostly opposite, 

 pale olivaceous green." 



17. DiCTYOsfpHON, Grev. Dictyosiphon. 



Frond filiform, tubular, continuous, branched. R<*>t mi- 

 nutely scutate, naked. Fructification; ovate scattered seeds, 

 lying- beneath the epidermis. Grev* Alg* Brit p. 55. t. S. — 



Nam.'; Sjktvo, a net, and crifuv, a tube, from the tubular and iv- 



ticnlated frond. 



1. D.ftBnictildceus, Grey, (fenncl-leavi I Dictyosiphon)* Grev. 



Ah. Brit. p. .*><>. /. 8. — Scytosiphon faenicul., Ag. Sp.Alg. r. 1. 

 /-. hi I. Conferva faznicul^ Units. — Fueus subtiiis. 'Turn. Hist. 

 I'm-, t. 234. 



In basins <>f water left l>\ die receding of tin' tide; upon Ck 

 lum end other .//.'.(•, frequent on the western coasts ami isles "i 8 

 land, and in the Firth of Forth. Dr. Greville. In Anglesea. DiUemms. 

 Cornwall. Hudson. Bantrj Bay, M Hutchnu t and Belfast, /' 

 Drummond. ©. Spr, and Summer. — " One to man j fee! long,mu< '■ bram h- 



