The species is often called A. peliscypha or A. peliocypha, a later name for the species (Knudsen et al. 2019). It is frequent in the Czech Republic and is circumpolar at a wide variety of elevations on siliceous rock in full sun. It can occur on iron-rich rock. It is most common at higher elevations in exposed habitats.
It has a thallus of brown areoles with mature apothecia in a thalline margin often 1 mm wide with a rugulose disc. It produces gyrophoric acid and has a KC/C+ red cortex. It cannot be distinguished morphologically from A. rugulosa and both species are variable in appearance. Anatomically A. squamulosa has a lower hymenium than A. rugulosa [100–120(–130) μm vs. (110–)125–140(–175) μm] and seldom do they overlap. If unsure check several apothecia.
Literature: Knudsen K., Arcadia in L. & Kocourková J. (2019): Acarospora squamulosa, the correct name for A. peliocypha. – Mycotaxon 134: 281–287.taxonomic classification: most frequented synonyms:Acarospora peliocypha
All records: 21, confirmed 20. One click on a selected square displays particular record(s), including their source(s).