Gigardna. Gigartjne^. 271 



Ilab. in maii aiistrali (Alonzios); ad liltora meridionalia Nova; 

 IloIIandia} (Miis. Paris!); ad Tasmaniam (Lyall!). 



Frons crassa plana margino angii.sto canaliculata, tripinnala nul ulto- 

 rius decomposita, a radicc librosa ercctiuscula spithama^a, jugamcnto pri- 

 niario 3—4 lineas iato, basi in stipitem teretiusculum, supernc in apicem 

 oblusum attenuato. A margine exeuiit pinn;p numerosa^ conformes, in- 

 feriores majores. Pinnukc basi exiniie altenuatse, oi)iongo-lanccoIal;p, aut 

 paulo supra basem summam attingentes latitudinem et oxinde in apicem 

 obtusuni ottenuat.-cj fertiles magis obovata), infra apicem cystocarpiis so- 

 lilariis mognis, in alterutera j)agina bemisplia-rice prominculibus instructse. 

 (lystocarpia quasi lobis spiraliler tortis umbilicata, apice ipso eniarginato, 

 infra sinus ita formatos nucleum sat conspicuum foventia. Substanlia 

 crassa cx gelatinoso carlilagiuea. Color lividus aut purpurascens. 



Nullo viso speciminc planta* Turnorianae qua-dam de identitate spe- 

 cicrum, quas supra conjunximus, dubia niDnent. Si descriptiones compa- 

 rantur ita tamcn conveniunt, ut species diversas vix suspicarer. Planta, 

 ([uam nomine Gig. lividic a Harvey accepi, a Sph. crassifolio fronde evi- 

 denlius canaliculata diffcrt. — Altamen dicere fas est, omnes auctores 

 charactercs plures specioi, quales supra exhibui, silentio pr;ttcriisse. 

 luitzing in suo Ch. livido pinnulas fructiferas teretes et cystoc;irpia mar- 

 ginalia describit, quare species plurcs sub nomine F. lividi confusas cre- 

 dere liceat. 



llf. Fronde hinc canaliculala dichofoma vel suhpinnala, cj/s/o- 



carpiis umbilicatis in par/ina convexa emergenlihus suh- 



marginalibus plurimis. 



14. G. ALVEATA (Turn. Hist. n. 239) fronde liinc convcxa, illinc 

 canaliculata lineari dichotomo-fastifjiata, segmentis siiporioribiis 

 approximatis, summis revolutis, cystocarpia nmbilicata ad mar- 

 gines pa^inoe convexae emergontia pUirima gerontibus. 



F. alveotus Turn. l. c. lab. ?39!! 



Spli. alveatus Ag. sp. p. "272 el Syst. p. 223! 



Chondrus alveatus Grev., Uook. et llarv. Alg. nov. Zel. p. !i47. 



Mastocarpus alvcatus Kiitz. sp. Atg. p. 732! 



Ilab. ad oras Novae Zelandia; (IJanksl lib. Greville! et Ifar- 

 voy!}. 



Frondes 2 — 4unciales, a radice sculata ercctiuscula^ numcrosaD grcga- 

 rise, lineares, vix lincam lata^, pcr totam longitudinem introrsum canali- 

 culatae extrorsum convexiusi:ul;p, in inferiorc parte parcius dichotonuc, 

 supcrne segmentis adproximatis fastigiatae, segmentis supremis revolutis, 

 apice obtusiusculo', axilhe aculiusculac patentcs. Cystocarpia ad scgmenta 

 superiora iu pagina convexiuscula juxta margincs emergcntia, rarius ipsum 



