Porina multipuncta (Coppins & P. James) Ertz, Coppins & Frisch

 

= Opegrapha multipuncta Coppins & James p.p.

     Thallus crustose, sometimes large, more or less embedded in its substrate, thin, smooth, brown-red to dark red-brown with greyish areas, covered with bright orange soralia, initially punctiform 0.2-0.5 mm in diameter, which can become confluent and form bright orange areas, fine and floury soredia. Perithecia very sparse, brown, partially immerged in thallus, 0.2-0.3 mm in diameter at base. Hyaline ascospores, 1-septate, 16-22 x 3-5.5 µm. Photobiont: Trentepohlia. C-, K-, KC-, P-. Corticolous species growing on the branches of bushes and shrubs (Crataegus, Prunus, Salix, Tamarix...) in the moors by the sea, sometimes at the base of the trunks of old oaks in the oceanic forests, very rarely on the rocks sheltered by the sea.

Cf. Zwackhia sorediifera is a species with more yellow soralia less colored in orange and C+ red.