. An introduction to the structure and reproduction of plants. Plant anatomy; Plants. 26o LICHENS ^-g^^^^^^^^^dmsj scattered throughout the thallus [ Collema) or occupying definite zones ( XantJwria parietina, Fig. 142, C). The association between Alga and Fungus is paralleled by the so-called " green cells " found in several aquatic animals [ freshwater Sponges, Hydra viridis) ; these are due to uni- cellular Algse (species of Chlor- ella, etc.), and in all such cases the partnership be- tween plant and animal appears to be of mutual benefit. In this connection it may be
. An introduction to the structure and reproduction of plants. Plant anatomy; Plants. 26o LICHENS ^-g^^^^^^^^^dmsj scattered throughout the thallus [ Collema) or occupying definite zones ( XantJwria parietina, Fig. 142, C). The association between Alga and Fungus is paralleled by the so-called " green cells " found in several aquatic animals [ freshwater Sponges, Hydra viridis) ; these are due to uni- cellular Algse (species of Chlor- ella, etc.), and in all such cases the partnership be- tween plant and animal appears to be of mutual benefit. In this connection it may be noted that various Algae are found commonly inhabiting the intercellular spaces of certain higher plants [ Duckweed, the Liverwort AntJw- ceros), but in these cases the Algte appear to be no- thing more than. Fig. 142.—A, soredium, and C, section through the thallus, of the Lichen Xatithoria parietina. al., algal cells ; hy., fungal ;. B, an algal cell from the Lichen Cladonia, illustrating the intimate relation between it and the fungal hypha2. (B after Bornet.) space-parasites seeking protec- tion. The ordinary cup-like fructifi- cations of Lichens originate from the Fungus, and the resulting ascospores reproduce the latter only, so that germination of the spores must take place in the presence of the appropriate Alga, if a fresh Lichen is to be formed. But multiplication in- volving the dual organism also occurs ; in this case algal cells surrounded by interlacing hypha: become detached, and when,. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Fritsch, Felix Eugene, 1879-; Salisbury, E. J. (Edward James), Sir, b. 1886. London, G. Bell and sons ltd.
Size: 1441px × 1735px
Photo credit: © The Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1920, booksubjectpl, booksubjectplants
