210 Cj-clospoiMiirr, Fucaceoe, Ascopliyllum. 



Engl. & Prantl Natiirl. Pflanzenfani. 97, p. 281, OzothaUia Decne et 

 Thiir. [1845] Rech. Fuc. p. 131, Kuetz. Sp. p. 591, Fnci, Fucodii, 

 Sci/tofhalice, Chordario}, Halidrios sp. auct. veter., Halicoccus 

 Aresch. [1846] Alg. Scand. exsicc. n. 51 & Phyc. scand. p. 254, 

 Phi/socaulon Kuetz. [1843] Phyc. gener. pag. 352. — Frons me- 

 (liocfis. disco radicali innata, compressa, linearis, ecostata, irregu- 

 laritm- dichotoma et lateraliter ramosa; vesiculse in linea segmen- 

 torum mediana sita? (rarius uullir) ; scaphidia in ramulis (rece- 

 ptaculis) lateralibus sini]ilii'ilius distinctis, suhinde caespitose con- 

 gestis evoluta, unisexualia, nouniuuiiuam (iu A. constricto) herma- 

 phrodita; oogonia typice 4-spora, rarius 3- aut 5-spora, ceterum 

 ut in Fuco. 



Qbs. Differt a genere Fuco fronde ecostata et oogoniis 3-5-spo- 

 ris (uec 8-sporis), 



1. Ascophyllum nodosum l.j Le .lol. Listo Alg. Clierb. p. 9(1. P.tiru. 331 

 et Tliur. Et. pliyc. tab. 18-211. Farl. Alg. of New Engl. p. 99, Kjellm. 

 Ilaiidli. I. p. 4, Ozothallia nodosa Decne in Ann. Sc. Nat. 1845, 

 p. 1:;, Kuetz. Sp. p. 591, Kjellm. Alg. of Arct. Sea p. 194, Phy- 

 socaulon nodosum Kuetz. Phyc. gener. p, 352, Fucodium nodo- 

 sum J. Ag. Sp, I. p, 206, Fucus nodosus L. Sp, plant. II, p, 1628, 

 Turn. Hist, Fuc. tab. 91, Karv. Phyc. Brit. t. 158, Halidrys no- 

 dosa Lyngb. Hydrophyt, Dan. p. 37, t. 8, Halidrys nodosa, congesta 

 et gracilis De la PyL Terr. Neuv, p. 108 et seq., Halicoccus nodosus 

 Aresch. Alg, Scand. oxsicc. n. 51, Phyc. scand. p. 254. — Fronde 

 compressa, repetite dichotoma aut decomposito-pinuata, pinnis li- 

 nearibus hic illic in vesiculas cx ovoideo ellipsoideas inflatis, re- 

 ceptacula subfasciculata piriformi-spliajrica longe pedicellata ge- 

 rentibus. 



Hah. in oceano Atlantico septentrionali a littoribus arcticis 

 Oroonlandia?. Norvegiai et Foeroearum usiiue ad Hispaniam et Ame- 

 ricaiii ; in mari Baltico; ad oras Brasiliffi(TiLESiDs). — Radix callum 

 ma;4num conicum sistens. Frondes aggregatge, 0,5-2 met. longa^ 

 Iuti"ii^iilivaceje, exsiccatione nigrescentes. e tereti compressse et 

 pinuatim distiche decompositse. Pinnaj frondi conformes, basi exi- 

 mie attenuatffi, ita ut specicm articulationis fere referant, lineares, 

 6-7 millim. lat;e et ubique a;quales, nisi quod hic illic in vesicu- 

 las ellipticas sint inflatw. Pinnuhe ultimse simplices, a basi atte- 

 nuata cuneato-lineares, c margine singulte aut plures fasciculatte, 

 altern^B aut oppositas, deuium apice in i-eceptacula inflatie, facile 



