391 



Ordo II. Si|ilioiie5e Grev. em. 



Siphonece Grev. [1830] \\g. Brit. p. 183 (excl. gen. Nemalion), J. Ag. [1887] 



Till Algeraes Systeraatik Vlll, p. 1. 

 Siphonacece Harv. [1858] Ner. bor. Amer. 111, p. 9. 

 Coeloblastece Kuetz. [1843] in Linnasa XVII, p. 94 (nec p. 105), Pliyc. gener. 



p. 302 (nec p. 330), Species p. 486 p. m. p. 



Thallus typice uiiicellalaris, tunc filiforrais (simplex aut ramosus) 

 tunc saccatus, tunc foliaceus vel forma varius, 1-multiiiucleatus ; 

 chlorophora disciformia, in stratu plasraatis parietali disposita '). 



Propagatio divisione cellulari, zoogonidiis neutralibus cellulisque 

 seu proliferationibus sejungentibus, acinetis. 



Generatio sive oosporis sive isosporis (zygotis). Oosporse singulae 

 intra oogoniura inclusse, ex oosphserse iramobilis ab antherozoidiis 

 mobilibus fecundatae transformatione ortse; isosporse (zygota) e co- 

 pulatione duorum zoogonidiorum conformium (isogametorum) efFor- 

 mat£e, dein novuin individuum evolventes. 



Conspectus Familiarum 



I. OoGAM-E : Oogonia et antheridia prsesentia. 



Vaiicheyiacece. Thallus fiiiformis, elongatus, caespitosus, ssepius 

 raraosus ; generatio oosporis in oogonio laterali evolutis et antheri- 

 diis lateralibus; zoogonidia magna, per totam superficiein ciiiata, in 

 ramorum apice inflato orta: adsunt quoque aplanosporoe Siphonese 

 terrestres vel aquaticse (hydro- aut halophilas), 



II. IsoGAM^ : Oogonia et antheridia haud prsesentia. 



A. Halophilae. 



* CelluUis vesicse pilei- tili- vel ramuli-formes, subinde foliacea?, ramis de- 

 stitutse vel ramis liberis donata^. 



Dasyclacliacece. Thallus substantia ssepius calcarea incrustatus, e 

 cellula stipitiforrai, basi radicante, continua, rarais verticillatis in- 

 structa constitutus: rami tum in discum pileiformem contigui sirn- 

 plicesque tum liberi et iterum ramellosi ; propagatio sporis (cystis?); 



1) De Siphonearum structura Cfr. etiam NoU Membranwaclistum und eini- 

 ge physiologische Erscheinungen bei Siphoneen in Botanische Zeitung 1887, 

 p. 473. 



