Lecania hutchinsiae (Nyl.) A.L. Sm.
Thallus crustose, thin, more or less rimose, areolate, dull grey, pale dull brownish, pale yellow-ochre, areole margins sometimes paler, prothallus unseen. Apothecia usually numerous, scattered all over the thallus or in small clusters, 0.3-0.5 mm diam., sessile, convex to markedly convex when immature, brown-pink, pale brown-ochre turning blackish when old, exciple inconspicuous except when young. Ascii 8-spored, 35-40 x 12-18 µm according to our measures. Ascopores ellipsoid apices rounded, colourless, 1-septate, 10-16 x 3-4,5 µm according to literature, 10-14 x 3-4 µm according to our measures. Photobiont: chlorococcoid. Chemical spot tests negative. Rare (or understated) but potentially abundant in favourable spots, on humid and shaded rocks, mostly sandstone, near the seashore. See Cliostomum tenerum = Lecania tenera rather similar but with smaller apothecia with pointed apices and thin exciple (seldom 1-3-septate), Pd+ red, and with a more maritime affinity, on sheltered and dryer rocks.