Siphoneas, Dasycladiaceae, Acetabularia. 417 



Sublaiiiilia secunda Acetabularieee Decaisne. 



Acelabulariece Decaisne [1842] in Ann. Scienc. Nat. II sdr., XVII, p. 328, Cra- 



nier [1888] Verticillirte Siphoneen p. 35. 

 Acetabulariacem Ilauck [18S5] Meeresalgen p. 484, De-Toni e Levi Fi. Alg. 



Ven. III, p. 94. 



Thallus omnibus partibus (rhizoidibus ramulisque piliformibus ex- 

 ceptis) calce incrustatus, ex axi typice simplici hinc inde nodoso-in- 

 crassato ramisque verticillatis, tum simplicibus tum polychotomis 

 constitutus. Rami fertiles et steriles inter se distincti; verticilli in- 

 feriores ramulis piliformibus, sterilibus, mollibus, polychotorao-ramo- 

 sis, demum deciduis et tunc umbilicos minutos linquentibus efTormati ; 

 verticilli superiores (singuli vel plures) e ramis simplicibus (utriculis 

 seu radiis) subclavatis, radiatim dispositis, liberis vel in discum um- 

 belliformem lateraliter arcteque coha^rentibus efformati. 



Multiplicatio : aplanospora^ iii ramis superioribus nunc momora- 

 tis (aplanosporangiis) numerosae orta^, dein zoogonidia copulantia gi- 

 gnentes. 



Conspectus generum. 



Acelabularia. Rami fertiles (superiores) in discura urabellitbrmem lateraliter 



omiiino arcte co]i;Tercntes. 

 Pali/pliysa. Rami fertiles usque ad basim liberi, singnlum verticilluni ad sti- 



pitis erecti apicera efricientes. 

 Halicoryne. Ranii fertdes quasi legurainirormes, usquo lul basira libori, plura 



verticilla efricientes. 



Genus dubium. 



^^ Pleiophijsa [Fortasse idem ac I{alicoryne\ 



ACETABULARIA (Tourn.) Lamour. [1816] Polyp. flex. p. 244 (litym. 

 aceladulum), Kuetz. Phyc. gener. p. 311, t. 11, Naeg. Neuere Al- 

 gensyst. p. 158, Zanardini SulT Androsace degli Antichi, Woron. in 

 Ann. Scienc. Nat. 4, XYI, De Bary et Strasburger in Hotan. Zeit. 

 1877, p. 713, Hauck Meeresalgen p. 481, Ardiss. Phyc. Medit. 11, 

 p. 178, Do-Toni e Levi Fl. Alg. Ven. 111, p. 94, J. Ag. Till Algernes 

 Systematik VIII, p. IGl, Cramer Verticill. Siplion. p. 35, Ace(a- 

 bulum Tourn. [1700J Inst. p. 509, t. 338?, CaUopilophorum Dij- 

 nati [1750] Zool. Adriat. p. 28, t. III, OUcia Pertol. [1810] Plant. 

 ital. dec. III, 117, non Gray nec Mont., Tubularice et Corallina} 

 sp. auct. nonnull. — Thallus umbelliformi-peltatus vel agaricifor- 

 mis, substantia calcarea incrustatus; stipes e cellula unica filifor- 



