Elementary botany . Fig. , branchedportion of frond show-ing Fig. iJ Section of cystocarp of rhabdonia, showingspores. periphery of a sterile tissue within the cavity. (See figs. 187, 188.) Goni-dia in the form of tetraspores are also developed in Rhabdonia. 379. Fertilization of the higher red algae.—The process of fertilization inmost of the red algae is very complicated, chiefly because the fertilized eggcell (procarp) does not develop the spores directly, as in Nemalion, Le- ALG^E CONTINUED: CLASSIFICATION. 175 let manea, etc., tut fuses directly, or by a short ce
Elementary botany . Fig. , branchedportion of frond show-ing Fig. iJ Section of cystocarp of rhabdonia, showingspores. periphery of a sterile tissue within the cavity. (See figs. 187, 188.) Goni-dia in the form of tetraspores are also developed in Rhabdonia. 379. Fertilization of the higher red algae.—The process of fertilization inmost of the red algae is very complicated, chiefly because the fertilized eggcell (procarp) does not develop the spores directly, as in Nemalion, Le- ALG^E CONTINUED: CLASSIFICATION. 175 let manea, etc., tut fuses directly, or by a short cell or long filament with oneor more auxiliary cells before the sporocarp is finally formed. Examplesare Rhabdonia, Polysiphonia,Callithamnion, Dudresnaya,etc. (fig. 189). The auxiliarycell then develops the sporo-carp. See fig. 189 for conju-gation of a filament from thefertilized procarp with an aux-iliary cell. 380. Uses of the red algae.—Many species produce a greatamount of gelatinous sub-stance in their tissues, andseveral of these are used forfood, for the manufacture ofg
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Keywords: ., bookauthoratk, bookcentury1900, bookdecade1900, booksubjectbotany
