In Europe, the species has temperate-atlantic to Mediterranean-subatlantic distribution. Its overall range is cosmopolitan in tropics and temperate zones. From P. perlatum, it differs in the web of thin white lines (maculae) on the upper side of lobes and chemically, medulla contains salazinic acid and therefore reacts yellow and later red if exposed to KOH. Parmotrema reticulatum grows on rather acidic bark of deciduous wooden plants and on moss-covered siliceous rocks. It can be found in open but moist forests, eventually in shrubs, at lower elevations. Lately, alike other similar species (Flavoparmelia soredians a Punctelia borreri), the lichen is expanding into central Europe. In the Czech Republic, a single thallus has been found so far, on Prunus spinosa near Rokycany in the western Bohemia in 2017.
Literature: Šoun J., Malíček J. & Vondrák J. (2019): Zajímavé nálezy lišejníků v Brdech a na Rokycansku. – Erica 26: 45–64.taxonomic classification:
Ascomycota → Lecanoromycetes → Lecanorales → Parmeliaceae → Parmotrema
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