1100 Eu-Floridese, Rytiphloefe, Vidalia. 



proveniens ad Pterosiphoniam cloiophyllam (Ag.) Falk. pertinet. 

 An revera hsec PterosiphonicB species in mari Sinensi reperiatur, 

 mihi dubium haeret. 



VIDALIA Lamour. [1824] in Dict. cl. V, p. 387 (Etym. verisimiliter a 

 gallico viatore Hoxorato Vidal), J. Ag. Sp. II, 3, p. 1117, Engl. & 

 Prantl Natiirl. Pflanz. (1897) p. 467, Falkenb. Rhodomelac (1901) 

 p. 423, Votubilaria Lamour. [1824] in Dict. cl. V, p. 387, Epi- 

 neuron Harv. [1845] in Lond. Journ. Bot. 1845, p. 532, Kuetz. Sp. 

 p. 532 partim, Spirhymenia Decne [1839], in Arch. Mus. II, p. 177, 

 Dictyomenia?, Fuci, Rytiphlosaz, Rhodomelce, Delessericc, Polyphaci, 

 Amansiaz, Sphcerococci, Carpophylli sp. auct. — Frons erecta, car- 

 noso-cartilaginea, compressa aut plana, saspe spiraliter torta, serra- 

 todentata, pinnatim decomposita aut prolificationibus ramosa, costa 

 immersa (aut deorsum prominente) venisque ad dentes excurren- 

 tibus percursa, oblique transversim zonata, nempe cellulis interiori- 

 bus secus duas series parallelas dispositis elongato-hexagoniis zonas 

 a costa oblique adscendentes formantibus, extus cellulis minutis 

 dense congestis corticata. Siphones pericentrales 5. Fructus in den- 

 tibus marginalibus aut prolificationibus transformatis evoluti. Cy- 

 stocarpia subglobosa, intra pericarpium cellulosum carpostomio 

 apertum, carposporas piriformes in articulo terminali filorum a 

 placenta radiantium foventia. Antheridia subglobosa, externo latere 

 dentis incurvi infra apicem seriata. Stichidia fasciculata, compla- 

 nata, lanceolato-linearia, incurva, tetrasporangiorum duplicem se- 

 riem longitudinalem foventia. 



Obs. Genus a Rytiphlcca et Enantiocladia caute dignoscendum, 

 sistit, sententia clari Falkenberg, quasi Amansiam corticatam. Se- 

 quentia de genere ab opere Agardhiano excepta, nonnullis obser- 

 vationibus additis, hoc loco referre placet. Frondes sunt membra- 

 nacese planae, ssepissime spiraliter torta?, nunc subcanaliculat» et 

 apice incurvse, nunc marginibus undulatae aut magis fortuito in 

 spiram contortse, ambitu lineares aut suboblongae, alterne serrato- 

 dentatae, evolutione dentium pinnatim subdivisae aut prolificatio- 

 nibus a costa emergentibus ramosa?, apice in tortis rectiusculo, 

 dentibus plus minus incurvis. Costa immersa frondem percurrit, 

 inferne magis evidens nunc subprominula, superne venis ad dentes 

 et pinnas alterne et angulo acuto excurrentibus continuata, inferne 

 sensim firmior caulem efficiens ancipitem aut teretiusculum, lamina 

 obsoleta denudatum, expansione scutata radicali suffultum. Fructus 



