Caloplaca ferruginea (Huds.) Th.Fr.
Lichen ferrugineus Huds., Fl. angl.: 444 (1762).
Thallus crustose, whitish to dark grey, very thin and continuous or thickish and areolate-cracked, areolae irregular, plane or uneven, effuse to determinate, prothallus blue-black, thin, thallus sometimes lacking, K-, corticolous or lignicolous. Apothecia scattered to crowded, 0.5-1(-2) mm diam., plane to convex, disc deep rust-red, matt, margin concolorous with disc or paler, entire, or flexuose, persistent. Ascospores biseriate oval-ellipsoid with rounded or slightly pointed apices, 2-locular, 13.6-17 × 6.8-9 µm, septum c. ½ length of spore. Chemistry: Emodin, parietin, xanthorin fallacinal, chloremodin, fragilin.
N: Sine loco (Colenso 6301 - BM). On Leptospermum bark.
Cosmopolitan
