[in French, additionally with Esperanto and English abstracts] Description of the new lichen genus Verrucariopsis Gueidan, Monnat & Cl. Roux gen. nov. whose type species, V. suaedae Gueidan, Monnat & Cl. Roux sp. nov., was discovered on the coast of Brittany and Loire – Atlantique, on the upper schorre of rias where it grows on stems of Suaeda vera, on the supralittoral zone. The morpho – anatomical and phylogenetic study showed that Verrucariopsis belongs to the Verrucariaceae family and that it is related to the marine lichen genera Wahlenbergiella, Mastodia and especially to the marine species Verrucaria halophila with which it is compared in detail. Proposal for the new combination Verrucariopsis halophila (Nyl. ex Branth et Rostr.) Gueidan, Monnat & Cl. Roux comb. nov. The thallus of Verrucariopsis suaedae is quite often parasitized by a lichenicolous fungus, Stigmidium verrucariopsidis Monnat et Cl. Roux sp. nov., described in appendix.