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Verrucaria fusconigrescens Nyl.

Synonyms:

Family: VERRUCARIACEAE

Habitat: Xeric supralittoral  zone

Description

   Thallus crustose, rather thin around 0.1 mm thick, non-gelatinous even when wet, areolate, areoles plane to gently convex, edges of areoles lightly browned, not pruinose, rather glossy, brown, dark brown to brown-blackish, prothallus dark brown visible between the areoles. Perithecia immersed in the thallus, but forming low to moderate projections 0.15-0.4 mm diam., seldom slightly prominent, ostiole hardly visible, apex spherical, black. Ascospores simple, oblong-ellipsoid,  20-24 x 7-10 µm. In xeric supralittoral zone spreading to the aerohaline zone on siliceous rocks, aspect rather variable according to exposition. Clearly distinct from Verrucaria (Hydropunctaria) maura that is much blacker (they can thrive together in the lower part of the xeric supralittoral zone)  and from  Verrucaria nigrescens that is calcicolous and grows only on calcareous rocks and cement of walls and is matt, dull black. On calcareous or alkaline rocks, on mortar of walls, see also Verrucaria viridula.*







Verrucaria fusconigrescens Habitat Pointe de Pen-Hir 5
Michel DAVID



Verrucaria fusconigrescens Cap de la Chèvre 1
Bernard BOUFFINIER



Verrucaria fusconigrescens Pointe de Pen-Hir 1
Bernard BOUFFINIER



Verrucaria fusconigrescens Pointe de Pen-Hir 2
Bernard BOUFFINIER



Verrucaria fusconigrescens Pointe de Pen-Hir 3
Bernard BOUFFINIER



Verrucaria fusconigrescens Cap de la Chèvre 2
Bernard BOUFFINIER



Verrucaria fusconigrescens Cap de la Chèvre 3
Bernard BOUFFINIER



Verrucaria fusconigrescens Camaret 1
Bernard BOUFFINIER



Verrucaria fusconigrescens Habitat Pointe de Pen-Hir 4
Michel DAVID



Verrucaria fusconigrescens Camaret 3
Bernard BOUFFINIER



Verrucaria fusconigrescens Pointe de Pen-Hir 6
Michel DAVID



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