Abstract
Microfungal assemblages in a soil beneath 30- and 50·year-old oaks and their 2-year-old stumps were studied using the soil dilution plate method. A total of 98 culturable microfungi were isolated. Compared to the living oaks before felling and the control living oaks, the density of <i>Mortierella macrocystis, Penicillium jonczewskii, Pseudogymnoascus roseus Sporothrix schenckii, Tolypoccladiumum inflatum</i> and <i>Umbelopsis vinacea</i> sigificantly inacased in the soil beneath slumps in the 32- and 52-year-old stands. Density of <i>Aspergillus kanagawaensis, Monodictys lepraria, P. daleae</i> and sterile dematiaceous hyphomycetes increased significantly in the 32-year-old stand and <i>Chrysosporium merdarium</i> in the 52·year-old stand. These fungi are known 'stimulants' of <i>Armillaria</i> rhizomorph formation. It is suggested that the increase in density of <i>Armillaria</i> rhizomorph 'stimulants' in a soil beneath oak stumps may increase the possibility of colonization of stumps by <i>Armillaria</i>.
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