Khodymeniacb^. 307 



tah. XXX. Kiitz. tah. Biyc. XV tah. 84. Mertensia 

 lumhricalis Both. l. c. tah. 1. 

 Cap. b. Spei. 



Species inqmrenda. 



Champia teipinnata Zanard. in Eegcnsh. Fl. 1851. p. 34. — 

 Pl. maris rtihri p. 69 Tah. IX fig. 2, — Ex icone haud 

 Champiam creclerem. 



Ordo X. RHODlMEIMACEJi. 



Algse inarticiilatse, raro inflato-tubulosse, ssepius solide- 

 scentes cellulosse, cellulis extimis nunc in fila verticalia con- 

 junctis. Cystocarpia frondi immersa aut intra pericarpium 

 externum nucleum nudiusculum rotundatum, lobis coalescen- 

 tibus simpKcem, aut columnis filorum sterilium lobos sepa- 

 rantium subcompositum, foventia; fila gemmidiifera a fundo 

 basali adscendentia articulata subpaniculato-ramosa aut sub- 

 corymbosa, ramis supra stipites steriles lobos discretos aut 

 subconfluentes nuclei formantibus ; lobi prsegnantes plus mi- 

 nus evidenter radiatim dispositi, obconici aut obovato-rotun- 

 dati, singuli gemmidia phirima rotundato-oblonga aut suban- 

 gulata, sine ordine conspicuo conglobata, muco cohibita fo- 

 ventes. Sphserospora3 per frondem sparsse aut in ramis pro- 

 priis evolutse, (in diversis Generibus) varie divisse. 



Rhodymeniacese a vicinis Ordinibus tum adspectu nuclei 

 raaturi, tum compositionis norma filorum prsegnantium differre 

 videntur. Nimirum fila prsegnantia in Rhodymeniaceis sunt 

 juveniha articulata, supra planum placentare cystocarpii quasi 

 fruticuhim paniculato-ramosum aut subcorymbosum constitu- 

 entia; rami principales et inferiores fruticuli sensim incras- 

 sati in stipites steriles loborum nuclei mutantur; rami se- 

 cundarii et exteriores (fruticuli) decompositione ramulorum 

 et subdivisione articulorum magis magisque trausmutantur 

 et in lobos nuclei maturi obcuneatos aut obovato-oblongos 

 convertuntur. Animadvertere quoque decet ramos filorum 

 gemmidiiferorum non eodem tempore maturescere; supcriores 



20* 



