Haustoria-Like Structures and Hydrophobic Cell Wall Surface Layers in Lichens

  • Rosmarie Honegger

Abstract

The polyphyletic, taxonomically very heterogenous group of lichen-forming fungi comprises about 21% of all fungi (±13 250 spp. or 46% of all ascomycetes, ±50spp./0.3% of basidiomycetes, and ±200spp./1.2% of imperfect fungi [20]). Lichen-forming fungi are nutritionally specialized, but otherwise normal representatives of their subclasses, and there are no reasons for separating them taxonomically from nonlichenized taxa. In only about 2% of lichens has the photobiont ever been determined at the species level [52], and very little is known about the range of compatible photobionts of individual lichen mycobionts. A large number of lichen-forming fungi seem to be moderately specific (several algal species of a genus are acceptable partners), but highly selective towards their photobionts (compatible photobionts are often very rare in natural ecosystems, and the most common taxa of free-living algae are not acceptable partners [16]). Unicellular and filamentous Charophyceae, Chlorophyceae and Ulvophyceae [34, 48] and/or nitrogen-fixing cyanobacteria (altogether about 100 spp.) have been identified as lichen photobionts [52]. The lichen symbiosis is not inheritable, but numerous taxa disperse very efficiently by means of vegetative symbiotic propagules.

Keywords

Biomass Permeability Sucrose Phosphorus Hydration 

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Copyright information

© Springer-Verlag Berlin Heidelberg 1991

Authors and Affiliations

  • Rosmarie Honegger
    • 1
  1. 1.Institute of Plant BiologyUniversity of ZürichZürichSwitzerland

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