Polysiphonia.] 



ALGJE CONFERVOIDEiE. 327 



our plant they are abundant, and form one of its most striking charac- 

 teristics. 



8. E. Mertensii, Ag. (Mertens' Ectocarpus); distichous, fila- 

 ments bipinnate, pinna? and pinnulse opposite unequal. Ag. 

 Sp. Alg. V. 2. p. 47.— Conferva Mertensii, E. Bot. t. 999. 



Sea-shore, very rare. Yarmouth, Mr. Wigg. Bantry Bay, Miss 

 Hutching. Coast of Durham, Mr. IV. Backhouse.— Filaments 1 — 2 

 inches high, tufted, much branched, pale yellowish-olive, regularly bipin- 

 nated, the pinnulae very slender, scarcely one-fourth the diameter of 

 the branch. The only fruit which 1 have observed, consists in granules, 

 imbedded in the swollen pinnulae. 



9. E. brachidtus, (brachiate Ectocarpus); " light brown very 

 much branched slender wavy entangled, the branches opposite, 

 crossing each other widely spreading with taper points, joints 

 cylindrical twice as long as broad." Sm. — E. cruciatus, Ag. 

 Sp. Alg. v. 2. p. 44.— Conferva brachiata, E. Bot. t. 2571. 



In salt-marshes at Cley, Norfolk, Messrs. Turner and Il»»ker.—l am 

 obliged to give the specific character of this plant (if it be indeed a dis- 

 tinct species) from E. Bot., having no access to authentic specimens. 

 Agarilh has unaccountably altered the name to cruciatus, and conferred 

 that of brachiatus on our E. sphecrophorus. 



Tribe XV. CERAMiEiE. 

 Plants red or purple, rarehj brown. Fructification double, dice- 

 cious ; — 1 . external capsules ; 2. polymorphous receptacles or 

 granules in swollen rainuli. 



59. Polysiphoxia. Grev. Polysiphonia. 



Filaments partially or generally articulate, longitudinally stri- 

 ated with internal parallel tubes. Fruit double.— -1. ovate 

 capsules famished with a terminal pore; 2. granules immersed 



in distorted rainuli. — Name : err///,;, many, ciZo., a tube. 



A. Main filaments inarticulate. 



1. i\ fruticuldsa, Grev. ( Shrubby Polysiphonia); root creep- 

 ing, filaments rigid inarticulate bushy, upper branches bi-tripin- 

 nate, lower ramuli sqnarrose, articulations of the rainuli ball as 

 long a- broad, Feins anastomosing. — Fucus frutsc^ulosus, W "If- — 

 Turn. Hist Fuc.t.227. E.BoLl [Q&Q^—Hutehmsia Wulfam, 



Aq. Sp. . I/;/, r. 2. />. !'■*>. 



On sand-covered rocks; extreme southern coast England. 



Bantry Bay, common, Miss Hutdms, Appin," Captain CarmckaeL 

 Miltown Malbay, Ireland, abundantly, W. //• Harvey.— Mr. Arnott 

 bas i ommunicated a verj beautiful plant from Whitsand Bej . which, for 

 the pro. nt, I consider a rarietj ofthia species, though not without 

 doubt that it ma\ Ian -after prove distinct The Hune plant was found 

 by Miss Hutchina at Bantry. The fronds are flat, l— - y lines in breadth, 

 iparinai] and irregularl) branched. Branches erect, with acute axill 

 with short alternate distichous ramuli, 1— <> Lines in length | the smaller 



