Calicium adspersum Pers.

Calicium species characterised by the yellow-pruinose fruiting bodies and the prominent grey thallus that contains norstictic acid (producing red crystals in the reaction with KOH). Like the other species of the genus, it sometimes tends to form an extensive thalli without fruiting bodies (only with black pycnidia). Then care must be taken to the potential confusion with C. salicinum.

Calicium adspersum is an epiphytic species, usually found in furrows of old oak bark, but it grows also on hard wood and on bark of other trees. In the Czech Republic, its distribution overlaps with the distribution of Quercus, it’s the most common substrate. It prefers relic habitats, such as scree margins, rock promontories or old-growth forests. It is a rare lichen, occurring mainly at lower and middle elevations. Exceptionally, it is reported from mountains, such as the Šumava Mts. More common it is for example in the Oslava River valley and in the Brdy Hills. Besides, it is rare, recorded usually only from one or a few trees.

taxonomic classification:

Ascomycota Lecanoromycetes Caliciales Caliciaceae Calicium

Red List (Liška & Palice 2010):EN – endangered
Red List (Malíček 2023):C3 – endangered

Occurrence in the Czech Republic

All records: 39, confirmed 37. 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