Pliteozoosporinio, Laminariaco;o, Costaria. 361 



Hab. ad littora Cauiciatroe (Uuimiec^ht). — Frons (laniiua) uie- 



diorris, 12 rui. alta, vix 5 ciu. lata. Lauiiua' latus altoruni altius 



cordatuni, fere sagittatnui, sursnui iuvolutnni. Margo iu stipitcni 



1()-1S niilliui. circiter latuni decnrreus, incrassatus. Radix lihrosa. 



COSTARIA Grev. [1830] Syu. Alg. P.rit. p. XXXIX (Etyui. cosla, co- 

 stce), Post. et Rupr. Rlustr. Alg. p. 12, t. 39, f. 47, Kuetz. Sp. p. 

 580, J. Ag. Sp. I. p. 139, De Toni Syst. Uebers. Fucoid. 1891, p. 

 177, Aresch. Observ. phycol. IV. p. 21, KjeUm. in Engl. & Prantl 

 Natiirl. Pflanzenfani. 97. Lief. p. 257, De Alton Saunders in Bo- 

 tanical Gazette XX, 1895, n. 2, p. 57, Faci, Agari, Laminario} 

 sp. auct. veter. — Radix fibrosa, fibris subsiniplicibus vel apice 

 furcatis. Truncus seu stipes snperne dilatatus, compressus. longi- 

 tudinaliter paucistriatus; strise in laminam intrantes et in plicas 

 uormaliter qniuque (raro unicam) al)euntes, in media parte folii 

 ovati divergentes, basi et apice couvergentes, lougitudiuales et co- 

 stseformes. Plicie per totam laminam crassitudine facta^ duo latera 

 dissinulia, alternm hitus tereti-rotundatum et costa^forme, alterum 

 cavum seu canaliculatum pra3bentes. Sporangia ad basin himiiKo 

 in sorum haud acute definitum collecta. 



Ohs. In altera laminas pagina tres inveniuntnr pliccTe costsefor- 

 mes, iii altera dua^ plicai caualiculatce. In adultiore folii lamina ob- 

 servantur inter plicas foramina rotundata et in ipsa meml)rana 

 rugae bulht^qne. Recedit Costaria reticulata De Alt.-Sannd. 



1. Costaria Turneri Grev. Syn. in Alg. Brit. p. XXXIX, Harv. Ner. 590 

 bor. Amer. I, p. 89, Alg. of Vaucouver Isl. p. 166, J. Ag. Sp. I, 

 p. 139, Aresch. Observ. phycol. IV, p. 20, Fucus costata^ Turu. 

 Hist. Fuc. tab. 226, Laminaria costata Ag. Sp. I, p. 109, Syst. 

 p. 269, Costaria costata De Alt.-Saund. in Botaii. Gazette XX. 

 1895, p. 57 (nomeu ineptum), Agarum quinquecostatum Bory in 

 Dict. class. IX, p. 193, non Costaria Turneri Post. et Rupr. — La- 

 mina inargine integra, lanceolata vel liueari-lanceolata. 5-costata. 

 HaJ>. ad oras occidentales Ainericge, praisertim al iusulam 

 « Vancouver » et littus CaliforniEe (Ruprecht, De Alton Saunders). 

 — Stipes 2 cm. ant paullo nltra longus, per totam longitudiuem 

 striis subparallelis notatus, ortu teres, mox coinpressus et demum 

 planus. Lamina longitndine maxiine ablndens nuuc etiam longit. 

 bipedalis, ad semidecimetrum lata, margine integerrima leniterque 

 undulata, basi in stipitem cuneathu decnrrens. Radix fibris sub- 



