Arthonia parietinaria Arthoniaceae
Arthonia parietinaria #

Lichenicolous on Xanthoria parietina

Probably widespread in lowland areas on thallus and apothecia of Xanthoria parietina. Thought to be more frequent than Arthonia molendoi

Ascomata usually in clusters of 10-50. Asci 8-spored, the spores hyaline, 1-septate, (9-)10-12(-13.5) x (3-)4-5(-6) Ám. The upper cell usually broader and slightly shorter than the lower. Micrographs below.

Similar: Arthonia molendoi, ascomata in groups of 2-5 or single


Arthonia parietinaria

Arthonia parietinaria

Micrographs
Arthonia parietinaria

Arthonia parietinaria
Arthonia parietinaria #
On ,Xanthoria parietina, Corfe Mullen, Dorset. February 2020

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