Rinodina sophodes (Ach.) Massal. ss. auct. brit. Cf.

      Thallus crustose thin and not very extended, 1-3 cm, surface irregular and cracked, greyish, pale purplish-brown, pale greenish-brown, olive-green, greenish, bordered by a conspicuous blackish hypothallus. Apothecia sometimes tight and grouped, 0.5-1 mm in diameter, initially submerged in the thallus, then slightly sessile, disc brown-blackish, thick concolorous margin on the thallus. Spores brown to greyish (in KOH), 1-septate, 13-19 x 6-9 µm according to the literature; 13-20 x 7-9 µm according to our measurements. Photobiont: green algae. No significant color reactions. Rare (or unnoticed) species growing on the twigs of trees or shrubs (especially at nodes or branches), with Lecanora sp. and Lecidella elaeochroma. NB This species belongs to a confused group defined by unreliable and often crossed characters, it is taken here in the sense of the British authors to whom it is closest but it remains very difficult to separate from neighboring species: Rinodina biloculata, Rinodina pyrina (nearest), etc. ; this determination is therefore only provisional pending clarification.