SPYRIJHK.I:. 337 



ORDO IV. SPYRIDIEE. 



Spyridieac J. Ag. mscr. Ceramiearum gen. J. Ag. et Auct. 



Frons articulata, sensim strato cellularum corticata. Cystocarpia 

 externa, pericurpio celluloso clause inunita, nuclfiolos plures, 

 transfonnatione lilorum a placenta radiantium formatos fo- 

 ventia; fila gemmidiifera paniculato-ramosa articulata, inlra 

 articulos superiores gemmidia numorosa oblonga, iterata divi- 

 sione endocliromatis orta, demuin nullo ordine conglobafa 

 muco solidesccrile conjuricta, fovontia. Sphcerosporce ad ra- 

 mellos cxterna 1 . 



Algae flliformos articulate, raox corticata?, ramosissimaa rauicl- 

 lisque ecorticatis ant cortice inter genicula interrupto instructis, 

 articulatis, monosiphoniis obsitac. Cellula; corticales rotundato-angiilahc 

 demura elongala?, strato plus minus crasso tubum prlinariuin mono- 

 siphonium obducentes. 



Organa fructificationis duplicis generis observata fuerunt. Cy- 

 stocarpia transformalione ramuli formata, externa et pedicellata, 

 rotundata aut bi-trilolia. Placenta contrails pcdunculum continiians 

 et ad apicem cystocarpii extensa, (ills densis dichotomo-fasligiatis 

 et anasloraosibus conjunclis contcxta. Ab liac colurana centrali 

 cystocarpii fila, ramoruin ad inslar, exeunt, quoquoversum radianlia, 

 pluiima elongata slorilia, alia breviora fertilia; sterilia subregulariter 

 dichotoma articulata, in cellulas peripbcricas desinentia; fertilia fa- 

 scicules pluros, ad diversos lobes tendontes, formantia, juvenilia pa- 

 niculato-ramosa, arliculis brcvibus oblongis constanlia, matura fasci- 

 culum uv;cformem obconicuui gemmidiorum coiiblitucntia. Gemmidia 

 divisione articulorum orta, oblongu demmiKjue mutua pressioncj 

 angulata, muco solidesccnto invicem separata atque in unum co- 

 Inbita. Sphasrosporae ad ramellos extcrnae, evolutione cellulaj nova; 

 aut transformatione cellulaj corlicalis formatoc, triangule divisaj. 



II. 



