Rhizocarpon macrosporum Räsänen

Rhizocarpon macrosporum is characterized by small bright yellow thalli composed of minute compact areoles on a notable black prothallus. Its spores are muriform and up to 70 µm large. In the field, it is indistinguishable from the common R. geographicum.

It is a continental species, distributed from central France and Spain to western Scandinavia. It usually grows on exposed dust-impregnated siliceous rocks, boulders or rock walls at higher elevations. In the Czech Republic, the lichen has recently been recorded in the Hřebenec nature reserve in the Brdy highlands, uranium heap piles near Příbram, Úpská jáma in the Krkonoše Mts and Velká Kotlina in the Jeseníky Mts.

Literature: Runemark H. (1956): Studies in Rhizocarpon, II. Distribution and ecology of the yellow species in Europe. – Opera Botanica 2: 1–150.

taxonomic classification:

Ascomycota Lecanoromycetes Rhizocarpales Rhizocarpaceae Rhizocarpon

Red List (Liška & Palice 2010):DD – data deficient
Red List (Malíček 2023):DD – data deficient

Occurrence in the Czech Republic

All records: 4, confirmed 4. One click on a selected square displays particular record(s), including their source(s).


record after the selected year
record before the selected year
records without date
Doubtful and erroneous records are not displayed.
credible record
doubtful record
erroneous record
record without revision

Altitude preferences

Distribution Timeline

Substrate type

Substrate preferences

© Botanický ústav AV ČR, v. v. i. 2020–2024