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  • Title: Common, unsightly and until now undescribed: Fumiglobus pieridicola sp. nov., a sooty mold infesting Pieris japonica from western North America.
    Author: Bose T, Reynolds DR, Berbee ML.
    Journal: Mycologia; 2014; 106(4):746-56. PubMed ID: 24891416.
    Abstract:
    Sooty molds (Capnodiaceae) are saprotrophs on the surfaces of leaves, and they take their nutrients from honeydew exuded by sap-sucking insects. We describe and illustrate the sooty mold Fumiglobus pieridicola sp. nov., which, to the dismay of gardeners, forms a thick black mycelial coating on the leaves and twigs of ornamental Japanese andromeda (Pieris japonica) in western North America. As a mitosporic species with a pycnidium that lacks an elongated neck and has at most a rudimentary stalk, the species belongs in the genus Fumiglobus. Although locally common, we found no specimens identified under Fumiglobus or its synonyms in regional herbaria and no record of any similar fungus in host indices. Our species differs from others in Fumiglobus in having smaller pycnidia and conidia and in having intercalary as well as apical pycnidia. We determined partial 18S and 28S ribosomal gene sequences for F. pieridicola, the first for any Fumiglobus species. Sequence analysis provides strong bootstrap support for including Fumiglobus within Capnodiaceae. We also determined 18S and 28S sequences for the type species of the mitosporic genus Conidiocarpus, also in Capnodiaceae. We confirm that Conidiocarpus is the anamorph of Phragmocapnias. Following the rules of nomenclatural priority, we propose the new combinations Conidiocarpus asiaticus, Conidiocarpus betle, Conidiocarpus callitris, Conidiocarpus fuliginodes, Conidiocarpus heliconiae, Conidiocarpus imperspicuus and Conidiocarpus siamensis. We hope that describing the mystery fungus from our region and providing sequences for its molecular identification will lead to new studies on its biology and distribution.
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