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Pseudocapillitium or true capillitium? A study of capillitial structures in Alwisia bombarda (Myxomycetes)

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We studied the capillitial structures produced in Alwisia bombarda (Reticulariaceae, Myxomycetes) by light and electron microscopy. This species develops tubular threads inside of clustered but still separate sporocarps with intact walls forming a cup. These threads have been considered to be a pseudocapillitium for a long time, but they do not represent remains of confluent peridia and thus do not correspond to the classical definition of a pseudocapillitium. Instead, they should be considered as a true capillitium. The structure of the capillitium in A. bombarda is very similar to that found in the genera Dianema and Lycogala, thus providing a new argument for a close relationship between the Reticulariaceae and Dianemataceae and also for considering the tubular threads of Lycogala as representing a true capillitium.
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Keywords: LICEALES; MORPHOLOGY; ONTOGENESIS; PHYLOGENY; SLIME MOLDS

Document Type: Research Article

Publication date: November 1, 2014

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  • Nova Hedwigia is an international journal publishing original, peer-reviewed papers on current issues of taxonomy, morphology, ultrastructure and ecology of all groups of cryptogamic plants, including cyanophytes/cyanobacteria and fungi. The half-tone plates in Nova Hedwigia are known for their high quality, which makes them especially suitable for the reproduction of photomicrographs and scanning and transmission electron micrographs.
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