1670 Eu-Floridese, Rliizophyllidacefe, Rhodopeltis. 



Grev. [1824] Fl. Edin. p. 286, Faci ai Fnrcellariai sp. auct. — Froiis 

 teretiusciila, dichotomo-fastigiata, suhtriplici strato coustituta.. Stra- 

 tum meduHare tilis elongatis densis loiigitudinalibus; iutermedium 

 cellulis brevioribus amplis granulosis; extornum cellulis minoribus 

 in fila moniliforinia, verticalia conjunctis constitutum. Cystocarpia 

 in spongiolis superficialibus evoluta, filis spongiolse adnata iisque 

 obtecta, plurima saepius adproximata; nucleus ellipsoideus, carpo- 

 sporis majusculis, obovatis, mutua pressione angulatis, a placenta 

 inclusa radiantibus, singulis sacculo hyalino inclusis coustans. 

 Tetrasporangia inter cellulas strati corticalis demersa, oblonga, plus 

 minus regulariter cruciatim divisa. Antheridia in nematheciis ver- 

 rucoso-planis evoluta, e filis parallelis ramosis apice racemos fer- 

 tilibus constituta. 



1. Polyides rotundus (Gmel.) Grev. Alg. Rrit. p. 70, tab. 2, Harv. 

 Phyc. Brit. t. 95, Pol/jides lumhricalis (Bauhin) Ag. Syst. p. 392, 

 J. Ag. Sp. II, p. 721, E]picr. p. 629, Florid. Morphol. t. 32, f. 4-9, 

 Hauck Meeresalgen p. 199, f. 86, Furcellaria liimbricalis Kuetz. 

 p. 402, t. 72, Sp. p. 748, Tab. Phyc. Vol. XVII, t. 100, Fiicus 

 rotundus Gmel. Hist. p. 110, t. 6, f. 3, Turn. Hist. t. 5, Fuciis 

 forceLlata liimhricalis Bauhin Pinax 366, VIII, Fucus marinus 

 forcellata, lamhricarim species Bauhiu Hist. 3, p. 800, Spongio- 

 carpus rotundus Grev. Fl. Edin. p. 286, Chordaria rotunda Ag. 

 Syn. p. 12, Hook. Fl. Scot. II, p. 97, Gigartina rotunda Lamour. 

 p]ssai p. 49, Furcellaria rotunda Lyiigb. Hydrophyt. Dan. p. 49, 

 Fucus radiatus (^ood. et Woodw. in Linn. Transact. III, p. 202, 

 Stackh. Nereis brit. t. 14, Fucus caprinus Gunn. Act. Nidr. 4, 

 t. 5, f. 4-5, Fucus fastigiatus L. partim. — Cliaracteres generis. 

 Hah. ad rupes in oceano Atlantico a littoribus Islandi», Nova^ 

 SemlicTB et Norvegi;e usque ad Hispaniam et Americam borealem. 

 — Frondes e disco radicali magno communi plures exsurguut !^- 

 15 cm. longa", 1-2 millim. crassit. lequantes, iuferne simpiiciusculs, 

 superne diviste, 6-8 et pluries dichotonice, fastigiat;e, axillis ;icu- 

 minatis (raro rotundatis), apicibus acutis obtusisve. Color nigre- 

 scenti-rufus. Substantia elastica, exsiccatione cartilaginea. R;uiii 

 tetrasporangileri nodoso-incrassati. Confer de hac specie Mettenius 

 Beitr. (1856) t. II, III et icones 37-39 iti Boru. et Thur. Etud. phycol. 



RHODOPELTIS Harv. [1863] Phyc. Austral. t. 264 (Etym. rhodos ro- 

 seus et jieltc peltaj, Schmitz Syst. Uebers. Florid. (1889) p. 20, 



