Incertae sedis Abrothallus microspermus Lichenicolous fungus, on thallus of Flavoparmelia caperata Widespread, especially in the south-west on Parmeliods including Punctelia, Parmotrema and Flavoparmelia. Black apothecia (spores brown, 1-septate 9.5-11 X 3-5 µm) are rare. The anomorph (previously known as Vouauxiomyces truncatus) has abundant superficial blackish pycnidia. Conidia 6.5-8 X 4-5.5 µm. Similar: Abrothallus parmeliarum can be found on Parmelia saxatilis, its anomorph (previously known as Vouauxiomyces santessonii) has conidia 7.5-10.5 x 5-7 µm. Abrothallus prodiens occurs on Hypogymnia physodes and Abrothallus parmotrematis on Parmotrema spp.

Abrothallus microspermus
Upton Country Park, Dorset. January 2013