aarnikarakka
Fibricium lapponicum
The aarnikarakka (Fibricium lapponicum) is a distinctive boreal fungus characterized by its fibrous, bark-like fruiting bodies that form intricate, web-like structures on decaying coniferous wood. This cryptic species displays a mottled brown and gray coloration that provides excellent camouflage against its substrate, and it plays a crucial ecological role as a primary decomposer in northern forest ecosystems, breaking down complex lignins and cellulose.
Taxonomy & Classification
Kingdom
Fungi
Phylum
Basidiomycota
Class
Agaricomycetes
Order
Hymenochaetales
Genus
Fibricium
aarnikarakka belongs to the family unknown, order Hymenochaetales, within the Agaricomycetes class.
Species Profile
The aarnikarakka (Fibricium lapponicum) is a distinctive boreal fungus characterized by its fibrous, bark-like fruiting bodies that form intricate, web-like structures on decaying coniferous wood. This cryptic species displays a mottled brown and gray coloration that provides excellent camouflage against its substrate, and it plays a crucial ecological role as a primary decomposer in northern forest ecosystems, breaking down complex lignins and cellulose.
Fibricium lapponicum faces significant threats from climate change, which is altering the cold, humid conditions essential for this Arctic-boreal fungus. Habitat degradation from logging and development in northern forests, combined with air pollution and acid deposition, further compromises the specialized microhabitats this species requires for survival.
Key Facts
Habitat & Distribution
This species occurs in old-growth boreal and subarctic coniferous forests, typically growing on decaying wood of spruce and other conifers in cool, humid microenvironments. It is found in northern Scandinavia and other circumpolar regions where it requires stable moisture conditions and specific substrate chemistry.
Threats
Climate change and warming temperatures
Logging and forest management practices
Air pollution and acid deposition
Changes in host tree availability
Habitat fragmentation
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). aarnikarakka (Fibricium lapponicum). SpeciesRadar: Intelligence for Earth's Biodiversity. Available at: https://speciesradar.org/species/aarnikarakka