Cécile Gueidan

Hydropunctaria maura, still often called by the older name Verrucaria maura and commonly known as tar lichen, is a species of saxicolous (rock-dwelling), crustose lichen belonging to the family Verrucariaceae. A perennial species that does not experience seasonal variations, it is the type species of the genus Hydropunctaria. The medulla is a black basal layer that forms columns (Latin: punctae) to the upper surface and isolates the algae into pockets near the upper surface. The black band formed by H. maura can often be seen at a distance as a marker of the high water point.

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Parabagliettoa is a genus of crustose lichens in the family Verrucariaceae. It has 3 species. The genus was circumscribed in 2009 by Cécile Gueidan and Claude Roux, with Parabagliettoa dufourii assigned as the type species.

Hydropunctaria rheitrophila is a widely distributed species of crustose lichen in the family Verrucariaceae. It grows on rocks in aquatic environments, typically in streams and rivers where it colonizes silica-containing substrates that are regularly submerged or wetted. The lichen forms a thin to thick crust-like body (thallus) that ranges in colour from pale brownish green to dark green, often dotted with black spots. It is widely distributed throughout the Northern Hemisphere, particularly in Europe, North America, and Asia, with some occurrences in the Southern Hemisphere including New

Hydropunctaria is a genus of saxicolous (rock-dwelling), crustose lichens in the family Verrucariaceae. The genus includes both aquatic and amphibious species, with members that colonise either marine or freshwater habitats. The type species, Hydropunctaria maura, was formerly classified in the large genus Verrucaria. It is a widely distributed species common to littoral zones. Including the type species, five Hydropunctaria lichens are considered marine species: H. adriatica, H. amphibia, H. aractina, H. orae, and H. oceanica.

Wahlenbergiella mucosa is a species of saxicolous (rock-dwelling), crustose lichen in the family Verrucariaceae. It is a marine species that grows in the littoral zone, and therefore remains immersed in seawater for extended periods. The lichen forms a smooth, shiny thallus up to 1 mm thick that varies in colour from olive-green in shaded areas to dark green or black in full sunlight. First described by Erik Acharius in 1803 as a member of the genus Verrucaria, it was reclassified in 2009 to the genus Wahlenbergiella following molecular phylogenetics research. The species is very common

Wahlenbergiella is a small genus of saxicolous (rock-dwelling), crustose lichens in the family Verrucariaceae. It comprises three species, all of which live in marine intertidal zones on exposed, nutrient-poor rocky shores where they get periodically immersed in seawater. Wahlenbergiella closely resembles another lichen genus that includes marine species, Hydropunctaria.

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Bagliettoa marmorea is a species of saxicolous (rock-dwelling), crustose lichen in the family Verrucariaceae. It is endolithic on calcareous rocks, meaning it grows under and around the rock crystals. The colour of the lichen is purple to pink, although sometimes it is grey with purple pigments visible only around the perithecia. It does not have a shield-shaped involucrellum, which is typical of several other species in genus Bagliettoa. The excipulum (the rim of tissue around the ascomata) measures 0.2–0.3 mm in diameter and lacks colour other than the upper part, which is purple.

Verruculopsis is a genus of saxicolous (rock-dwelling), crustose lichens in the family Verrucariaceae. The genus was established in 2007 when DNA studies revealed that several species previously classified elsewhere actually formed their own distinct evolutionary group. Most species in the genus live as parasites on bright orange crustose lichens, though one species grows independently on rock surfaces without needing a host.

Wahlenbergiella tavaresiae is a species of saxicolous (rock-dwelling), crustose lichen in the family Verrucariaceae. Known from several locations in the San Francisco Bay area of the United States, it is a marine lichen that inhabits intertidal zones, and as such is immersed in seawater on a regular basis. Associated algal species include the red algae Hildenbrandia and Mastocarpus papillatus, and the brown algae Pelvetiopsis and Fucus. Petroderma maculiforme, a brown alga, is the photobiont partner in the lichen.

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Heteroplacidium compactum is a species of areolate, crustose lichen in the family Verrucariaceae. It has a cosmopolitan distribution. It is a lichenicolous lichen, growing as a facultative parasite on other lichens, typically on non-calcareous rock. It has rod-shaped (bacilliform) conidia measuring 5–7 μm long, and ascospores that are 11–18 by 8–10 μm. Heteroplacidium zamenhofianum is a closely related species distinguished by having perithecia situated in the algal layer, and smaller ascospores (14–16 by 6–7 μm) with a more narrow ellipsoid shape. The lichen was originally described in 1857

Willeya protrudens is a species of saxicolous (rock-dwelling), crustose lichen in the family Verrucariaceae. Found in northern Vietnam, it was formally described as a new species in 2014 by Cécile Gueidan. The type specimen was found growing on calcareous rock outcrops in the Na Hang Nature Reserve (Na Hang district, Tuyên Quang). The species epithet protrudens refers to the projecting perithecia, a morphological feature distinguishing it from other Willeya species.

Willeya laevigata is a species of saxicolous (rock-dwelling), crustose lichen in the family Verrucariaceae. Found in northwest Vietnam, it was formally described as a new species in 2014 by Cécile Gueidan. The type specimen was found growing on shaded calcareous rock outcrops in a rainforest in the Mai Châu district of Hòa Bình province. The species epithet laevigata refers to the smooth upper surface of the thallus.

Willeya iwatsukii is a species of saxicolous (rock-dwelling) crustose lichen in the family Verrucariaceae.

Willeya fusca is a species of saxicolous (rock-dwelling), crustose lichen in the family Verrucariaceae. Found in Vietnam, it was formally described as a new species in 2014 by Cécile Gueidan. The species epithet fusca refers to its characteristic dark brown areolate thallus, a feature that distinguishes it from other Willeya species.

Willeya australis is a species of saxicolous (rock-dwelling), crustose lichen in the family Verrucariaceae. Found in Indonesia, it was formally described as a new species in 1954 by Dutch lichenologist Pieter Groenhart, as Staurothele australis. He found the type specimen growing on rocks in the falls of the Brantas River (Malang, East Java). Although he included it in the genus Staurothele, he suggested that a placement in Willeya might also be appropriate. Cécile Gueidan made that generic transfer official in 2014 following molecular phylogenetic analysis of Staurothele and related genera

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