Eu-Florides, Ceratodietyesz, Ceratodictyon. 409 
| Conspectus generum. 
Ceratodictyon Zanard. — Frons ramis anastomosantibus reticulata, in con- 
textu spongiarum symbiotice inhabitans. Cystocarpia in ramellis propriis 
minutissimis verruciformibus subsessilia. 
Gelidiopsis Schimtz. — Frons erecta, irregulariter ramosa, sspe spongophila. 
Cystocarpia in ramulis ultimis solitaria aut aggvegata, sessilia. 
CERATODICTYON Zanard. [1878] Phycez papuanz p. 36, n. 8 (Etym. 
ceras cornu et dZcfyom retis), Schmitz Syst. Uebers. Florid. 1889, 
p. 9, Schm, et Hauptfl. in Engl. & Prantl Natürl. Pflanzenfam. 
p. 988, Marchesettia Hauck [1882] Sopra ale. Alghe delP Oceano 
Indiano p. 9, Hedwigia 1889, p. 175. — Frons irregularis, vario 
modo ramosa, e ramis tenuibus, teretibus, dense implicatis, plu- 
ries lateraliter connexis concrescentibusque contextum spongiz- 
forme semulantibus constituta. Hami stratum medullarem demum 
laxum cellulis tenuibus elongatis constantem, stratum corticalem 
cellulis introrsum majoribus, extrorsum gradatim minoribus com- 
positum praebentes. Cystocarpia in ramulis fertilibus verrucifor- 
mibus parvis numerosa, lateraliter affixa, subsessilia, late ovoidea, 
pericarpio crassissimo, carpostomio terminali pertuso instructa, 
nucleum erectum, subglobosum, placentà nullà, filis carposporiferis 
ramosis numerose coadunatis compositum foventia, carposporis ex 
articulis filorum superioribus efformatis. Sporangia in cortice api- 
cum ramulorum nematheciose incrassato evoluta, sparsa, irregula- 
riter cruciatim divisa. 
Obs. Genus singulare, spongiophilum. 
1. Ceratodictyon spongiosum Zanard. Phyce:x papuans n. 8, Spongia 796 
cartilaginea Esper fide Semper Nat. Existenzbed. d. 'Thiere II, 
p. 177-191, cfr. etiam Marchesetti in Atti Museo Civico di Storia 
nat. di Trieste 1884, Marchesettia spongioides Hauck Sopra alc. 
Alghe dell Oceano Indiano (1882) p. 9, n. 3, t. III, Hedwigia 1889, 
p. 175, Asken. Alg. Forschungsreise Gazelle p. 40, t. XII, f. 1-11. 
— Characteres iidem ac generis. 
Hab. cum Spongiis symbiotice crescens in Oceano Indico 
et Pacifico calidiore (ZaNARDINI, HAUCK, ASKENASY); eadem (?) spe- 
cies in mari Adriatico, semel abunde in concha Arcae Noae L. 
e profunditate 100-140 metr. arrepta prope insulam «Zlarin» Dal- 
mati? e (A. VALLE, Hauck) 
