Myriolecis semipallida forma

    Thallus endolithic, inconspicuous, greyish to blackish. Apothecia numerous, sessile, 0.5-1.5 mm in diameter, flat to slightly convex disc, pale gray-brownish, pale yellowish-gray, pale pinkish-gray, margin relatively thin, more or less crenate sometimes and quite persistent , cream-yellowish. Thallus: C-, K-, KC-, P-, UV + yellow-orange; apothecia: C + pale yellow-orange, K + yellow, KC + yellow, P-. Species occurring on low acid rocks (Armorican sandstone) of the aerohaline zone. Differs from Myriolecis (Lecanora) semipallida in paler colorations and thinner, creamy-yellowish margin of apothecia and appears to be quite similar to Lecanora xanthostoma.