Echinodontium ryvardenii is described as a new species. It is characte
rized by conchate, effuse-reflexed or resupinate basidiocarps, toothed
hymenophore, presence of blackish resinous line next to the substratu
m, clamped hyphae, incrusted cystidia, amyloid, ellipsoid and warted-r
ough basidiospores.