. A handbook of cryptogamic botany. Cryptogams. Fig. 282.—l/snea barbata Fr. Development of soredes. «, group of eight algal cells attached to hypha ; b^ similar group with branching hj-pha ; f, sorede with algal cell in optical section ; d^ sorede with algal cells divided ; f, _^ germinating soredes ( x 500—700). (After Schwenderier.) over the other. The same species of alga, however, may be found in consortism with different species of fungus, and taking part in the com- position, therefore, of differently formed thalli—different lichens in Fig. 2S3.—Cetrttria islandica Ach., a fruti
. A handbook of cryptogamic botany. Cryptogams. Fig. 282.—l/snea barbata Fr. Development of soredes. «, group of eight algal cells attached to hypha ; b^ similar group with branching hj-pha ; f, sorede with algal cell in optical section ; d^ sorede with algal cells divided ; f, _^ germinating soredes ( x 500—700). (After Schwenderier.) over the other. The same species of alga, however, may be found in consortism with different species of fungus, and taking part in the com- position, therefore, of differently formed thalli—different lichens in Fig. 2S3.—Cetrttria islandica Ach., a fruticose lichen (natural size). Stahl experimentally proved this in his successful attempts at lichen sjmthesis. The algse which furnish the hosts belong to different groups, and both unicellular and filamentous forms occur. The thallus of lichens is of two sorts, the heteromerous and the. 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 Bennett, Alfred W. (Alfred William), 1833-1902; Murray, George Robert Milne, 1858-. London, New York, Longmans, Green, and Co.
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