The ultrastructure of the physical contact between fungus and alga has been examined in six species of the lichen family Teloschistaceae. The relation between the fungus and living algal cells was found to be merely one of very close proximity of their cell walls. Only a few distorted algal cells were found to be intracellularly invaded by the fungus. The association between the symbionts was compared with that previously observed in lichens of the Lecanoraceae and Lecideaceae.
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