Selected material of lignicolous species of the genusLachnum from the Czech Republic was studied. Lachnum impudicum and Lachnum subvirgineum (nom.prov.) are published for the first time from the Czech Republic. These taxa were not distinguished in earlier Czech literature. Lachnum crataegi, Lachnum corylinum, Lachnum fasciculare, Lachnum fulvellum and Lachnum piceum are lectotypified here. Lachnum fulvellum is a synonym of Lachnum fasciculare, and Lachnum piceum of Lachnum pygmaeum. Lachnum impudicum as well as Lachnum corylinum are close (possibly synonyms) to Lachnum pubescens (type specimen of L.pubescens examined).Lachnum crataegi is close to Lachnum fasciculare. One specimen from authentic material of Lachnum grande is designated alectotype and Lachnum grande is synonymised with Lachnum pygmaeum. Lachnum pygmaeum was found to be avariable taxon. In the studied set of material, lignicolous specimens of Lachnum pygmaeum show wider and somewhat more protruding paraphyses than non-lignicolous specimens. Lachnum rhizophilum seemed to be the earliest possible name for the non-lignicolous taxon (with asci arising from croziers). The type of Lachnum rhizophilum, however, is a fungus with asci arising from simple septa.
Suková M. (2005): A revision of selected material of lignicolous Lachnum species from the Czech Republic with a note on graminicolous material of the Lachnum pygmaeum complex. – Czech Mycology 57(3-4): 183–219.
