Akinetes are resistant cells which have the ability to persist in sediment for several decades. We have investigated the temporal distribution of akinetes of two species, Dolichospermum macrosporum and Dolichospermum flos-aquae, in a sediment core sampled in Lake Aydat (France), which covers 220 years. The upper part, from 1907 to 2016, the number of akinetes fluctuated but stayed at high conce...

The paper describes three new records of lichen genus Rhizocarpon (R. alpicola, R. grande and R. lavatum) from South Korea. Brief taxonomic description and comments are provided for the new records. An artificial key is also provided for known species of this genus in South Korea.

The new combination Stereocaulon plicatile (Leight.) Fryday & Coppins is made for a previously enigmatic crustose lichen with submuriform ascospores; the basionym, Lecidea plicatilis Leight., was previously misapplied to a norsticticacid containing species of Rhizocarpon. The systematic position of the crustose Stereocaulon leucophaeopsis group is discussed. ? 1996 The British Lichen Society