Hydropunctaria symbalana (Nyl.) Cl. Roux = Hydropunctaria amphibia Taxon de Méditerranée.

    Thallus crustose, markedly tightened to the underlying rock, thin, not glossy, greenish very dark when moist, black to blackish when dry, sometimes slightly cracked, seldomly ribbed radially towards the margin, no visible prothallus or then slashed. Perithecia immersed, more or less protruding, conical to hemispherical, with apices eroded, uneven and sometimes nicked (some volcano cone like). Ascospores simple, colourless, narrowly ellipsoid, 12-16 x 6-7 µm, 13-15 x 5-6 µm according to our measurements. Mediterranean taxon, on siliceous rocks of the foreshore, just above sea level.

N.B. This species has long been considered a Mediterranean taxon of Hydropunctaria amphibia which is an Atlantic taxon but this way of considering this taxon was not sustainable given that the habitat was different because it was subject to the rhythm of the tides

_ N.B. Very similar by its blackish colour to and often confused with Hydropunctaria maura but this latter is oceanic with flat and little protruding perithecia.