145 



LXXI. RYTIPHLjEA. J. Ag. SyiYib. p. 9.6. 



268. R. pinastroides Ag. Syn. Grev. Alg. Brittann. p. 104. 



Hab. in sinubus parum profundis ad saxa demersa, luce ct undis exposita 

 in utroque mari frequenter. 



269. R. tinctoria Ag. sp. p. 62. fronde compressa piano-sub? 

 canaliculata ex margine bipinnata, pinnis utrinque aequaliter 

 pinnuiatis lamina rachide subcontraria , pinnule sublinea- 

 ribus laevibus apice incurvis. 



Hab. in scrobiculis parum profundis, unda ssepe superfusis soleque maxi- 

 me expositis utriusque maris; in Adriatico usque ad Insulam Pago Eiasotetto \ 

 In Mediterraneo ad Nicaeam, Pozzuoli, etc. 



Csespites 2-3 pollicares densissimi, ex crusta radical! surgcnles, basi Ic- 

 viter purpurascentes superne-lutescentes, ex loco natali arreptoe citissinie in 

 purpureum abeuntes, exsiccatione denique nigreseentes. Frons plana sed 

 leviter canaliculata , simplex aut ramosa, bipinnata apice incurvo obtusa, 

 Pinnae ex margine disticha?, paulo supra basin oblique ita tortae ut paginam 

 planam nee marginem rachidi advertant , pinnulata&, pinnulis ulrinque 

 sequaliter evolutis sublinearibus et utrinque Ia3vibus, apice involuto. Cellulae 

 frondem constituentes centrales majores hexagono - prismaticae eodem 

 piano verticali et horizontal! dispositae apparentiam frondi articulatara tri- 

 buunt, qua3 tamen ob cellulas irregulares externas in recenti, nisi luce adver- 

 titur, parum conspicua, in exsiccata, ubi minus collabuntur genicula quam 

 pars media cellularum, quasi rugae transversales interiore canaliculi latere 

 observanda est. 



Var. horridula : pinnis densioribus subdivaricatis pinnulisque 

 recurvis frondem bine teretiusculam subtegentibus. 



Hab. ex Insula Pago dedit BiasoleUo. 



9.70. R. semicristatanov. sp. fronde compressa plano-subcanali- 

 culala, apice acuminato rectiuscula ex margine bipinnata, 

 pinnis inferioribus utrinque subsBqualiter pinnuiatis , supe- 

 rioribus sursum nudis deorsum pinnuiatis, lamina rachide 

 parallela, pinnulis a basi latiori attenuatis subrecurvis dorso 

 cristatis. 



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