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A SEM–study of Listerella paradoxa (Myxomycetes)
Authors:Uno Eliasson  Elisabeth Gilert
Affiliation:Dept of Systematic Botany, Univ. of Gothenburg, Carl Skottsbergs Gata 22, S–413 19 Gothenburg, Sweden.
Abstract:Apart from the presence of a capillitium, the fructifications of Listerella paradoxa Jahn resemble those of some species of Licea Schrad. Similarities exist in general appearance, mode of dehiscence, structure of peridium, and sculpturing of spores. The capillitium of Listerella is attached near the margins of the peridial lobes, and the moniliform threads are extensions from pillars from which the threads sometimes break. Aberrant capillitial outgrowths may be reminiscent of the processes bordering the peridial lobes in Licea. Although mostly found on podetia of the lichen genus Cladonia, Listerella may also occur on other substrates. A large–spored specimen developed on an oak leaf in California falls within the intraspecific variation of L. paradoxa. LwtereWa–resembling species of Licea may also occur on Cladonia. An x–ray analysis did not reveal any Ca or other elements with an atomic weight equal to or above that of Na in peridium, capillitium and spores of L. paradoxa , nor in peridium, peridial protuberances and spores of Licea pusilla Schrad.
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