On the identity of Lachnum winteri (Ascomycota, Helotiales).

Abstract

Syntypes of Lachnum winteri (specimens of the exsiccatae collection Rehm, Ascomyceten, No. 113) deposited in the herbaria S, K and M were examined. The syntypes contain the same species with short-stalked apothecia possessing whitish, pale yellow to yellow, sparsely warted and apically attenuated hairs corresponding to the genus Albotricha. The species differs from A. albotestacea not only in the colour of the apothecia and frequent presence of whitish subicular hyphae at the base of the stalks, but also in the structure of the ectal excipulum. The thinner ectal excipulum cell walls are considered to be the main character distinguishing the species from A. albotestacea. The species is regarded to be a good member of the genus Albotricha, hence the new combination A. winteri is proposed. A lectotype is designated and a description, line drawing and photographs are presented. The concept of L. winteri introduced by J. Velenovský is also discussed.