INTRASPECIFIC INTERACTIONS AND PARASITISM IN AN ASSOCIATION OFRHIZOCARPON LECANORINUMandR. GEOGRAPHICUM |
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| Institution: | 1. COMET, Department of Earth Sciences, University of Cambridge, Cambridge, UK;2. Department of Earth Sciences, University of Cambridge, Cambridge, UK;1. School of Earth and Environment, University of Leeds, Maths/Earth and Environment Building, Leeds LS2 9JT, UK;2. School of Earth Sciences, University of Bristol, Wills Memorial Building, Queens Road, Bristol BS8 1RJ, UK;3. Palaeontology Section, Earth Science Department, The Natural History Museum, Cromwell Road, London SW7 5BD, UK;4. 146, Church Hill Road, Sutton, Surrey SM3 8NF, UK |
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| Abstract: | Intraspecific thallus interactions in mixed populations ofRhizocarpon lecanorinumR. geographicumin North Wales are described. In contrast to the most commonly occurring morphotype ofR. geographicumwhich forms mosaics comprised of sharply delimited individual thalli,R. lecanorinumthalli consistently merge with one another at intraspecific contacts, leaving no visible trace of their initial boundaries. On the analogy of mycelial interactions in populations of wood-rotting and other non-lichen-forming fungi, it is postulated that these differences are the outcome, inR. geographicumof somatic incompatibility between distinct genotypes, and inR. lecanorinumof somatic compatibility among genetically identical or very closely related thalli. Possible mechanisms for the evolution of clonal population structure inR. lecanorinumand links between somatic interactions and reproductive output in these species are discussed. Facultative parasitism ofR. lecanorinumbySchaereria fuscocinereaand resistance to such parasitism by co-occurringR. geographicumare also documented. |
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