S62 Confervoidese, Cladoplioracero, Microdictyon. 



Trans. V, p. 109, tab. 7, Microdictyon Velleyanum Decne P]. 

 Arab. p. 115. — P>onde umbilicata, rigidiuscula, subsessili, folia- 

 cea, prolifera, commissuris quadratis. 



Hab. in mari rubro (Rupreciit, Piccone, Zanardini), atlan- 

 tico ad (3ades, pacifico ad ins. Sandwich et Novam-Hollandiam 

 (Harvey), mediterraneo in sinu neapolitano (Schmitz) et adriati- 

 co (Zanardini, IIauck); etiam ex ins. Mauritii indicatur (Dickie). 

 — Thallus explanatus, initio foliaceus vel flabelliformis, basi ra- 

 dicans, dein irregulariter horizontali-expansus, ad plura cm. latus 

 quandoque ramellis radiantibus substratu affixus; articuli 60-140- 

 200 a. lati, opposite ramosi, ramis junioribus alternatim et uni- 

 lateraliter exenntibus. Areola? plerumque irregulariter 4-5-angu- 

 lata^; articuli diametro 2-4-plo longioribus. 



2. Microdictyon Calodictyon Decaisne 1. c. Kuetz. Species pag. 512, or>i 

 Tab. Phyc. VII, pag. 10, t. 25, f. 2, Anadyomene Calodictyon 

 Mont. Pl. cell. Canar. p. 180, tab. 8, fig. 1. — Fronde umbilicata, 

 solitaria, suborbiculari, fusco-nigrescente, ad 1 dm., diam. margine 

 dissecto et lobato, venis quinis, mediis erectis, binis inferioribus 

 patentibus (nec deflexis) ; commissuris irregularibus polygoniis. 



Hab. s£epe inter Caulerpas in portu «Orotava)) ins. Tene- 

 riffse (Webb sec. Montagnb) ad aArecife» ins. Lauzerota3 (E. 

 D'Albertis sec. PlCCONE), in Archipelago insularum Fortunata- 

 rum et ad ins. uGran Canaria» (LiebEthrut sec. Grunow). — 

 Observante cl. A. Piccone Crociera del Corsaro alle isole Madera e 

 Canarie p. 19, n. 12 vix, ut jamdudum suasit cl. Zanardini, a Mi- 

 crodictyo umbilicato (Vell.) Zanard. sejungendum. 



3. Microdictyon Spongiola Berth. Vertheil. Alg. im Golf von Neapel m 

 in Mittheil. aus der Zoolog. Station zu Neapel III. Band, IV. Heft, 

 1882, p. 49C). — Caispites laxos, spongiformes, globosos efficiens ; 

 ramis undique ex axi exsurgentibus, nec regulariter iusimul kccre- 

 scentibus ut in Microdictyo umbilicalo. 



Hab. ad P e y s s n n e I i a ra S q u a m a r i a m et P e y s s o n n e • 

 liara rubrara ad latus septentrionale ins. ((Caprin in sinu nea- 

 politano maris mediterranei (G. Berthold). — (cAn ab hoc dif- 

 fert Mic>'odictyon Schmitzii Miliar.?,- an potius Boodlea?)). 



4. Microdictyon Schmitzii Miliar. Beitr. zur Kenntn. der Algenveg. 96:^ 

 von Griechenland, Meeresalgen der Insel Sciathoj pag. 13, t. 1, 



f. B-C. — Thallo rotundato, 1-2 cm. diam. metiente, e globo cavo 

 2 mm. crasso constituto, subinde horizontaliter expanso mucoso- 

 que; ramis annuli interioris haud in eadem planitie at in spa- 



