
Clustered Bracket
Inonotus cuticularis
**Clustered Bracket (Inonotus cuticularis)** The Clustered Bracket is a distinctive polypore fungus characterized by its overlapping, shelf-like fruiting bodies that form tiered clusters on tree trunks. These brackets typically display a reddish-brown to dark brown upper surface with a velvety texture, while the underside features small pores rather than gills.
49
Countries
Photo: Wikimedia Commons (CC) via https://en.wikipedia.org/wiki/Inonotus_cuticularis
Taxonomy & Classification
Kingdom
Fungi
Phylum
Basidiomycota
Class
Agaricomycetes
Order
Hymenochaetales
Family
Hymenochaetaceae
Genus
Inonotus
Clustered Bracket belongs to the family Hymenochaetaceae, order Hymenochaetales, within the Agaricomycetes class.
Species Profile
**Clustered Bracket (Inonotus cuticularis)** The Clustered Bracket is a distinctive polypore fungus characterized by its overlapping, shelf-like fruiting bodies that form tiered clusters on tree trunks. These brackets typically display a reddish-brown to dark brown upper surface with a velvety texture, while the underside features small pores rather than gills. As a wood-decomposing fungus, it plays a crucial ecological role by breaking down dead and dying hardwood trees, recycling nutrients back into forest ecosystems and creating habitat cavities for various wildlife species. This species demonstrates a remarkably broad global distribution, occurring across temperate regions of North America, Europe, and Asia, with additional populations documented in parts of South America, Africa, and Australia. It primarily inhabits deciduous and mixed forests, typically growing on beech, oak, and other hardwood species. The fungus shows preference for mature forest environments with established tree populations. Despite its wide geographic range, Inonotus cuticularis faces mounting pressure from habitat fragmentation and the loss of old-growth forests. Intensive forestry practices that remove dead and dying trees eliminate essential substrates for the species' reproduction and survival. Climate change may also affect its distribution patterns, though specific impacts remain poorly understood due to limited population monitoring. Currently, no species-specific conservation programs exist for the Clustered Bracket. Its protection largely depends on broader forest conservation initiatives and sustainable forestry practices that maintain dead wood in forest ecosystems. The species' vulnerable status reflects the general decline of old-growth forest habitats, though its ultimate trajectory remains uncertain without comprehensive population assessments.
The Clustered Bracket (Inonotus cuticularis) is declining primarily due to habitat loss from deforestation and forest degradation, which removes the old-growth deciduous trees it depends on as a host. Additionally, air pollution and climate change are affecting the delicate ecological conditions required for this fungal species to thrive.
Key Facts
Habitat & Distribution
Threats
Deforestation and habitat loss
Loss of old-growth host trees
Air pollution affecting forest ecosystems
Climate change altering forest conditions
Forest fragmentation
Found in 49 Countries
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). Clustered Bracket (Inonotus cuticularis). SpeciesRadar: Intelligence for Earth's Biodiversity. Available at: https://speciesradar.org/species/clustered-bracket