Toninia squalida (Ach.) Massal.

    Thallus very thick, convex, sometimes with large fissures, formed of 1-3 mm squamules with lobed ends, overlapping each other, gray-brownish in dry weather, greenish-brown in wet weather. Apothecia 1-1.5 mm in diameter, disc initially flat then convex, blackish, fine margin disappearing in old age, concolorous. Spores needle-like, 4-7 septate, 23-41 x 2.5-4.5 µm. No significant color chemical reactions. Photobiont: chlorococcoid. Mountain or alpine species found on mossy soils rich in humus or in cracks in soft rocks.

N.B. Species associated with cyanolichens or cyanobacteria, at least in its youth.