4 Cebmie.^. Callitlinmnion. 



4. Frons reticulo filorimi anastomosantium constituta. 



Frons cornpressa pinnata, filis anastomosantibns 



tubum centralem investientihus . . . XII. Ptilocladia. 

 Frons plana lohata costis costulisque flahelli- 



formiter radiantihus XIII. Haloplegma, 



TRIBllS II. CERA^IIEtI!]. Sph£erosporis morphosi cellulse cor- 

 ticalis formatis. 



a. Frons distincte articulata, tuho interiorr amplo; spJice- 



rosporce in cellulis corticalihus grniniloriDn evolutee. 



Frons inordinate corticata, cortice aut conti- 



nuo aut zonas interruptas formante . XIV. Cebamium. 

 Frondis cellulis corticalihus suhrectangularibus 



in series longitudinales ordinatis . . XV. Centroceras. 



b. Frons cxterne suhcontinua ifjimerse articulata; tuho 



, intcriore amplo ; cellulce splKErosporiferce suhin- 

 ordinatcB. 



Sph(Brosporis apices incrassatos incurvos fron- 



dis occupantibus . . . XVI. Campyl^phora. 

 „ in segmentis penultimis vix mu- 



tatis immersis .... XVII. Microcladia. 



c. Frons cxternc continua, tuho interiore ccntrali pcri- 



centrales cellulas (Bmulante. 

 Frons compressa pinnatim decomposita . . . XVIII. Carpoblepharis. 



I. CaLLITHAMNION Lh. J. Ag. sp. Vol. II. p. 5. 



Frons filiformis ramosa articulata monosiphonia, nuda aut 

 fihris articulatis intra membranam externam a basi ra- 

 morum decurrentibus inferne corticata, nunc ramulis ar- 

 cuatim reflexis, secus caulem decurrentibus in stratum 

 proprium, ramellis novis demum hirtum, compositis stu- 

 posa. Favella; stepe binse, axillares vel ad ramulos ses- 

 siles, nudse, ramulisve paucis vix mutatis stipata3, intra 

 periderma hyalinum gemmidia plurima angulata foventes. 

 Sphcerosporce transformatione ramuli aut articuli termi- 

 nahs formatse, in ramulis nudse oblongo-sphsericse trian- 

 gule aut cruciatim divisse. 



