Four new species of the Ascomycete genus Microglossum are recognized, based on morphological characters and DNA sequences of nuc rDNA (ITS region and 28S gene) and the second largest subunit of RNA polymerase II (RPB2). They differ from Microglossum nudipes by the color of the ascocarps and the sizes and shapes of ascospores, asci, and paraphyses. A lectotype is proposed, and an emended description is provided for M. nudipes. Descriptions of new species Microglossum clavatum, M. truncatum, M. pretense, and M. tenebrosum are provided. Other closely related species in the group of green earth tongues include Microglossum viride, M. rickii, and M. griseoviride. An identification key to green Microglossum species is presented.

b Faculty of Forestry and Wood Technology Mendel University in Brno Zemědělská 3 CZ 613 00 Brno Czech Republic

Plant Biology and Biodiversity Center Institute of Botany Slovak Academy of Sciences Dúbravská cesta 9 SK 845 23 Bratislava Slovakia

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$a Kučera, Viktor $u a Plant Biology and Biodiversity Center , Institute of Botany, Slovak Academy of Sciences , Dúbravská cesta 9, SK-845 23, Bratislava , Slovakia.

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$a Taxonomic divergence of the green naked-stipe members of the genus Microglossum (Helotiales) / $c V. Kučera, P. Lizoň, M. Tomšovský,

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$a Four new species of the Ascomycete genus Microglossum are recognized, based on morphological characters and DNA sequences of nuc rDNA (ITS region and 28S gene) and the second largest subunit of RNA polymerase II (RPB2). They differ from Microglossum nudipes by the color of the ascocarps and the sizes and shapes of ascospores, asci, and paraphyses. A lectotype is proposed, and an emended description is provided for M. nudipes. Descriptions of new species Microglossum clavatum, M. truncatum, M. pretense, and M. tenebrosum are provided. Other closely related species in the group of green earth tongues include Microglossum viride, M. rickii, and M. griseoviride. An identification key to green Microglossum species is presented.

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$a Lizoň, Pavel $u a Plant Biology and Biodiversity Center , Institute of Botany, Slovak Academy of Sciences , Dúbravská cesta 9, SK-845 23, Bratislava , Slovakia.

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$a Tomšovský, Michal $u b Faculty of Forestry and Wood Technology , Mendel University in Brno , Zemědělská 3, CZ-613 00 Brno, Czech Republic.

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