204 APPENDIX. 



xres roundish or elliptical, in 

 cells; every cell qfthi spore-thread finally changed into a spore, 



III. Corallenac&b. Frond calcareous. Spore-threads of four 

 Bpores. (CoraUina, Jania, Melobesia, ffapalidium.) 



IV. SPHiEBOCOOOOiD&fi. Frond cartilaginous or membranaceous. 

 Spore-threads separating into many spores. (Delesseria, XI- 

 tophyUwm, CaUiblepharis, Spha rococcus, Oracilaria.) 



*** Placenta axial, or suspended by filaments vn the car!/;/ of 

 the conceptacle. 



V. Gelidiace.e. (Gelidium.) 



§ '1. NucL us not lodgi I 'n a holloiv conceptacle. 



* Nuclei several, contained in wart-like excrescences. 



VI. Spongiocarpe^e. Frond cylindrical and branched. (Polyides.) 



VII. Squamarie.e. Frond lichenoid, rooting from lower surface. 

 (Peyssonnelia, HUdenbrandtia, Petrocelis, Cruoria, Act' no- 

 coccus.) 



** Nuclei immersed in the frond. 



VIII. Helmtnthocladie.e. (Nemaleon, Helminthocladia, Helmin- 

 ihora, Scinaia.) 



### ]Y uc l e i naked, external, involucrate. 



IX. Wrangeliace.e. (Wrangelia, Naccaria.) 



Ser. 2. GOXGYLOSPERMEuE. Sporiferous-nucleus subglobose, 

 either simple or formed of maun nucleoli. Numerous spores 

 congregated without order in each nucleus or nucleolus. 



* Frond inarticulate, flat or cylindrical, compound. 



X. Rhodymentace.e. Spores developed within the cells of moni- 



liform filaments issuing from a centre. ( Wormshioldia, Plo- 

 camium, Rhodymenia, Rhodophyllis, Euthora, Cordylecladia, 

 Stenogramme ? ', Dumontia, Catenella, Chylocladia.) 



XI. Cryptoxemiace.e. Spores developed within solitary or aggre- 

 gated detached mother-cells. (PhyUophora, Gyrnnogongrus^ 

 Ahnfeldtia, Cystoclonium, CallophyUis, Kallymenia, Gigartina, 

 Chondrus, Halymenia, Furcellaria, Gratcloupia, Schiaymenia, 

 Gloiosiphonia.) 



** Frond filiform, articulate, monosophonous ; the articula- 

 tions naked, or coated with small cellules. 



XII. Spyridiace.e. Sporiferous-nucleus compound, lodged in an 

 external conceptacle. (Spyridia.) 



XIII. Ceramiace.e. Sporiferous-nucleus simple, external, naked, 

 or involucrate. (Microcladia, Ceramium, Dudresnaia, Orou- 

 cmia, Ptilota, Griffithsia, Corynospora, Seirospora, Callitham- 

 nion.) 



