. Elementary botany . Fig. 418. Lichen (peltigera), section of thallus ; dark zone of rounded bodies made up largely of the algal cells. Fungus cells above, and threads beneath and among the algal cells. feet state of development which it attains when not in connection with the fungus. On the other hand the fungus profits more than the alga by this association. It forms fruit bodies, and perfects spores in the special fruit bodies, which are so very distinct in the case of so many of the species of the lichens. These plants have lived for so long a time in this close associa- tion that the fun
. Elementary botany . Fig. 418. Lichen (peltigera), section of thallus ; dark zone of rounded bodies made up largely of the algal cells. Fungus cells above, and threads beneath and among the algal cells. feet state of development which it attains when not in connection with the fungus. On the other hand the fungus profits more than the alga by this association. It forms fruit bodies, and perfects spores in the special fruit bodies, which are so very distinct in the case of so many of the species of the lichens. These plants have lived for so long a time in this close associa- tion that the fungi are rare'y found separate from the algae in nature, but in a number of cases they have been induced to grow in artificial cultures sep- arate from the alga. This fact, and also the fact that the algae are often found to occur separate from the fungus in nature, is regarded by many as an indication that the plant body of the lichens is composed of two distinct or- ganisms, and that the fungus is parasitic on the alga.
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Keywords: ., bookcentury1800, bookdecade1890, bookpublisher, booksubjectbotany
