Arthonia spadicea Arthoniaceae
Diarthonis spadicea (Arthonia spadicea)

Growth type crustose
Thallus negative. Apothecia and pycnidia K+ pale purple

Can be abundant near the base of shaded, basic-barked, deciduous trees in moist woodlands

Immersed or greyish-green thallus with +/- rounded, flat or convex, black apothecia and frequent pycnidia. Spores 1-septate, 7-11 x 3-4 Ám. Microscope photograph below.

Similar: Arthonia didyma and Arthonia vinosa

Arthonia spadicea

Arthonia spadicea

Microscope photograph
Arthonia spadicea
Arthonia spadicea
Holton Lee and Puddletown, Dorset. December 2012, April 2017

All images used are copyright. Please contact me if you find errors.