Bosknoopjeskorst
Bacidia circumspecta
Bosknoopjeskorst (Bacidia circumspecta) is a crustose lichen species that forms thin, grayish to pale greenish crusts on bark surfaces. This inconspicuous lichen produces small, dark apothecia (fruiting bodies) and plays an important ecological role as a pioneer species in forest ecosystems, contributing to nutrient cycling and providing microhabitat for invertebrates.
Photo: iNaturalist: (c) Tomás Curtis, some rights reserved (CC BY-NC), uploaded by Tomás Curtis
Taxonomy & Classification
Kingdom
Fungi
Phylum
Ascomycota
Class
Lecanoromycetes
Order
Lecanorales
Family
Ramalinaceae
Genus
Bacidia
Bosknoopjeskorst belongs to the family Ramalinaceae, order Lecanorales, within the Lecanoromycetes class.
Species Profile
Bosknoopjeskorst (Bacidia circumspecta) is a crustose lichen species that forms thin, grayish to pale greenish crusts on bark surfaces. This inconspicuous lichen produces small, dark apothecia (fruiting bodies) and plays an important ecological role as a pioneer species in forest ecosystems, contributing to nutrient cycling and providing microhabitat for invertebrates.
Bacidia circumspecta, a critically endangered lichen species, faces severe threats from habitat loss and degradation of its specialized substrate requirements. Air pollution and climate change are significantly impacting the delicate environmental conditions this lichen needs to survive, while its extremely limited distribution makes it highly vulnerable to local extinctions.
Key Facts
Habitat & Distribution
Bacidia circumspecta grows exclusively on the smooth bark of deciduous trees, particularly favoring the trunks and larger branches of mature beech, oak, and maple trees in old-growth and semi-natural forests. The species requires stable microclimatic conditions with high humidity and minimal direct sunlight, typically found in the understory of well-established woodland ecosystems.
Threats
IUCN Red List: Critically Endangered
Bacidia circumspecta, a critically endangered lichen species, faces severe threats from habitat loss and degradation of its specialized substrate requirements. Air pollution and climate change are significantly impacting the delicate environmental conditions this lichen needs to survive, while its extremely limited distribution makes it highly vulnerable to local extinctions.
Air pollution and atmospheric changes
Climate change impacts
Extremely limited population size and distribution
Habitat loss and fragmentation
Substrate degradation
Community Sightings
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Sources & Attribution
How to Cite
IUCN: IUCN (2025). The IUCN Red List of Threatened Species. Version 2025-1. Available at: https://www.iucnredlist.org. doi:10.2305/IUCN.UK.2025-1.RLTS
GBIF: GBIF.org (2025). GBIF Home Page. Available at: https://www.gbif.org
This page: SpeciesRadar (2025). Bosknoopjeskorst (Bacidia circumspecta). SpeciesRadar: Intelligence for Earth's Biodiversity. Available at: https://speciesradar.org/species/bosknoopjeskorst