1460 Eu-Floridese, Ceraniiese, Ceramium. 



proprium formantia, ima sua parte inter cellulas geniculi bracteantes immersa, 

 superiore sua parte denudata invicem libera. 



VII. Tribus Pachygonia J Ag. Anal. algol. II, p. 22: species geniculis totius 

 frondis intercedente zona transversali nuda invicem distinctis, zonas corti- 

 cales latas et crassiusculas, supra articulos sat conspicue prominulas ipsis 

 formantibus, corticalibus cellulis forma parum diversis rotundatis, in geni- 

 culis superiorum ramorum densius conjunctis, in geniculis vero adultioribus 

 paulo laxius dispositis, pluribus majoribus, minores quasi per cyclades junctas 

 foventibus, aliis minoribus simplicioribus nondum aut parcius divisis, ro- 

 tundatis, omnibus quasi gelatina cobibitis; tetrasporangiis intra genicula 

 psenultima vix conspicue mutata immersis, duplici serie transvei*sali dispo- 

 sitis, verticaliter demum emissis. 



\ Tetrasporangia immersa, series transversales intra genicula formantia. 



21. Ceramium elegans Ducl. Ess. p. 53 (excl. syn. et variet.), J. Ag. 2280 

 Sp. II, p. 124, Epicr. p. 97, Anal. algol. II, p. 22, Ardiss. Phyc. 

 Medit. I, p. 101, Boryna diaphana Gratel. mscr., Ceramium atte- 

 nuatum Menegh. in Giorn. botan. ital. 1844, p. 182, Kuetz. Sp. 

 p. 667, J. Ag. Sp. II, p. 138, Ceramium diaphanum v. breviarti- 

 culatum et v. attenuatum Ardiss. Florid. ital. I, 2, p. 36, Hormo- 

 ceras polygonum Kuetz. Tab. Phyc. XII (1862) p. 21, t. 67, f. c-e 

 vix t. 100, f. a-b, Trichoceras clavatum Kuetz. Tab. Phyc. XIII 

 (1863) p. 1, t. I, f. c-d, Gongroceras gymnogonium Kuetz. Sp. 

 p. 679?, Ceramium gymnogonium Menegh. in Giorn. botan. ital. 

 1844, p. 183 fan forma monstrosa?), J. Ag. Sp. II, p. 138?, Ce- 

 ramium capitellatum De Not. mscr., Dufour Elenc. Alg. Lig. 

 n. 101, Ceramium strictum auct. partim. — Fronde subsetacea, 

 regulariter dichotomo-decomposita fastigiata, segmentis erecto-pa- 

 tentibus, terminalibus forcipato-erectis, articulis inferioribus dia- 

 metro 2-6-plo longioribus, interstitiis pellucidis zonas longitudine 

 superantibus; tetrasporangiis subduplici serie circa genicula verti- 

 cillatis, fere in media zona strati corticalis immersis, ipsa cellula 

 fertili extrorsum nudiuscula; cystocarpiis in ramulo subtermina- 

 libus, involucri ramellis subdivisis cystocarpium longe superantibus. 

 Hab. in sinu Lugdunensi-gallico et in viciniore mari Ligustico 

 (De Notaris, Dufour, Strafforello); in mari Tyrrheno, Jonico 

 et Adriatico tum ad Venetias (Kuetzing) tum ad oras Istme ac 

 Dalmatiae (Meneghini, Kuetzing); in oceano Atlantico ad Gades 

 (J. Agardh). — Frons plerumque usque 7 cm. longa, crassitie 

 setacea, regulariter dichotoma prolificatioiiibusque sparsis obsita, 

 sensim attenuata. Apices incurvato-forcipati. Articuli plerumque 



