Variability of Byssomerulius corium in the Mediterranean

The variability of the common corticioid Byssomerulius corium is discussed. Emended descriptions of both species and genus Byssomerulius are provided and a xerophilous variety (B. corium var. halileensis, growing on Quercus calliprinos wood in a sub-arid region of the East Mediterranean in Israel) is proposed. Basidiocarps representing the new variety can be diagnosed by their almost smooth or minutely folded hymenium. B. corium var. halileensis greatly resembles the species B. armeniacus, in need of further study.