Incertae sedis Lecania rabenhorstii Growth type crustose. Chemical results negative Identification of specimen with dark apothecia is uncertain Previously considered to be mainly coastal but also occurs inland on base-rich rocks and walls Thick areolate thallus, yellowish-grey, non-pruinose with +/- eroded patches. Apothecia to 0.7mm, orange-brown pruinose discs, margins very pruinose, sometimes excluded. Spores 1-septate, 11-13(-16) x 4-7 µm. Microscope photograph below. Similar: L. turicensis. Pruinose thallus and apothecia

Microscope photograph

Lecania rabenhorstii
Hamworthy, Dorset. January 2014