Caloplaca arnoldii (Wedd.) Zahlbr. ex Ginzb.

A locally common species, currently included in the genus Calogaya. It is characterized by yellow-orange, small thallus with marginal lobes. In shady conditions, however, the lobes may be completely absent. It is a saxicolous lichen, which can be found on basic silicates or limestone rocks, especially on overhangs. It also often grows on anthropogenic substrates, such as stones or concrete in the walls of castle ruins. It occurs, more or less, throughout the entire Czech Republic. Moreover, many of the reports of C. saxicola from this territory probably refer to C. arnoldii. At the present, the meaning of the name C. saxicola is unclear and we recommend not to use it.

taxonomic classification:

Ascomycota Lecanoromycetes Teloschistales Teloschistaceae Caloplaca

most frequented synonyms:Calogaya arnoldii
Red list:CR – critically endangered

Occurrence in the Czech Republic

All records: 58, confirmed 47. One click on a selected square displays particular record(s), including their source(s).

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Altitude preferences

Distribution Timeline

Substrate type

Substrate preferences

© Botanický ústav AV ČR, v. v. i. 2020–2023