17G1- Eu-Floride0e, Corallinacese, Melobesia. 



Hab. in mari Mediterraneo. — Sec. Foslie speciem sistit generis 

 A rchceolithothamnii. 



PARA8P0RA Heydr. [1900] Weit. Ausbau des Corallinensystems p. 315. 

 — Genus est Lithothamnioideum, pro Lithotliainnio fruticuloso 

 (Kuetz.) Fosl. institutum. 



MELOBESIA Lamour. (1812] Polyp. flex. p. 315 emend. limit. (Etym. 

 an Melobosis aut Meliboia, Oceani filia?), Kuetz. Sp. p. 695 pro 

 maxima parte, Aresch. in J. Ag. Sp. IT, p. 510 quoad subgen. I 

 (partim), Hauck Meeresalgen p. 260 excl. spec, Ardiss. Phyc. Medit. 

 I, p. 441 quoad subgen. Melobesiam partini, Engl. & Prantl Na- 

 turl. Pflanzenfam. (1897) p. 541, Hapalidiam Kuetz. [1843' Phyc. 

 gener. p. 385, Sp. (1849) p. 695, Agardhia Menegh. [1838' Cenni 

 Organogr. Alghe p. 42 (non Agardhia Gray 1821, nec Cabrera 

 1823, neque Sprengel 1825), Agardhitut Nardo (sec. Meneghini), 

 Juergensia Reich. (1841] Nomenel. p. 22 (non Spreng. 1818), Plecto- 

 derma Reinsch 'j [1875], Milleporce, Nulliporoe, Hapalidii, Phyl- 

 lactidii sp. auct. — Frons plana, horizontaliter crustaceo-expansa, 

 pagina inferiori tota adnata, calce incrustata, mono(-pluri)-stroma- 

 tica, strato basali seriebus cellularum radiato-flabellatim dispositis 

 formato. Conceptacula carposporifera superficialia, conica aut he- 

 misphrerico-conica, poro apicali instructa. Conceptacula sporangifera 

 (cavitate schizogena) superficialia aut paullo immersa, conica aut 

 hemisphajrico-conica, poro centrali apice aperta. 



Obs. Nonnulli auctores pro hoc genere describunt conceptacula 

 tetrasporanglfera teginen porosum gerentia; at species hunc cha- 

 racterem prtebentes ad Lithothamnion aliaque genera pertinent. 



Suhgen. I. Eumelobesia Fosl. Rev. Syst. Surv. of Melob. p. 20. — Frons, ex- 

 cepta regione prope conceptacula, monostroruatica. 



1. Melobesia farinosa Lamour. Polyp. flex. p. 315, 1. 12, f. 3, Kuetz. Sp. 2832 

 p. 096, Tab. Phyc. XIX, t. 95, f. c-e, Aresch. in J. Ag. Sp. II, p. 512, 



') A Melobesia vix ditferre videtur genus Plecfoderma Reinsch Contrib. (1875) 

 p. B2, duas species amplectens. quarum una (P. majus Reinsch I. c. t. XXXVII, 

 f. 1) ad Florideas in mari Adriatico pr. Tergeste Istrise lecta, altera (P. 

 tninus Reinsch 1. c. t. XXXVII f. 2-3) in Algis variis ac Zoophytis locis variis 

 tum Europte, tum Afric89 australis et Americse borealis inventa fuit. Crustee seu 

 frondes sunt monostromaticse; fructus ignoti manent. 



