Lichen Physiology and Cell Biology

pp 287-302

Fine Structure of Different Types of Symbiotic Relationships in Lichens

  • R. HoneggerAffiliated withCytologie, Institut für Pflanzenbiologie, Universität Zürich

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Many different groups of fungi became independently and at various times lichenized. As they are symbiotic with a wide range of distantly related phyco- and cyanobionts with structurally and compositionally distinct cell walls, it is not surprising that many different types of symbiotic relationships can be found among lichens. Extensive comparative light microscopic studies of the mycobiont-phyco- or cyanobiont interface in distantly related lichens were carried out by Tschermak (1941) and Plessl (1963) who, respectively, first observed a correlation between the anatomical organisation or evolutionary stage of a lichen and the type of mycobiont-phycobiont relationship. Their data were largely confirmed by different transmission electron microscopic (TEM) studies (reviewed by Honegger, 1984)