Enterographa serusiauxii
Enterographa serusiauxii is a leaf-dwelling lichen in the Roccellaceae family. It lives on living leaves in Guadeloupe and was described as a new species in 2020 by Elise Lebreton and André Aptroot. The type specimen was collected in Littoral de Robin, Trois Rivières, Guadeloupe, on living leaves of Garcinia humilis in a coastal forest. The species had been found years earlier by Father Casimir Le Gallo but wasn’t published, and it was recollected in 2019.
The name honors Belgian lichenologist Emmanuël Sérusiaux for his work on foliicolous lichens and the lichen flora of Guadeloupe.
What it looks like: a crust-like, pale-cream to off-white thallus with tiny warts, up to about 0.9 cm across and 0.1 mm thick. The photobiont partner is a green alga from the genus Trentepohlia. The lichen’s apothecia are oval to irregularly slit-shaped and sit inside the thallus.
Reproduction and chemistry: there are eight ascospores per ascus; the spores are hyaline, 7–9 septate, and about 27–29 by 2.5–3.5 μm. The medulla contains gyrophoric acid, which gives a positive C test (red).
Where it’s found: so far, it is known only from Guadeloupe, growing on living leaves of Garcinia humilis and Calophyllum calaba near the coast.
This page was last edited on 3 February 2026, at 14:58 (CET).