The genus Lecidea in the lichen flora of the gypsum soils of Spain is
represented by two species: L. gypsicola Llimona and L. circinarioides
Casares & Hafellner sp. nov., which are described in this article. Ch
emical, anatomical and ecological differences are also described, as i
s the taxonomic value of the morphological characteristics of the matu
re ascoma. (C) 1996 The British Lichen Society