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Byssoporia terrestris (DC.) M.J. Larsen & Zak

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Scientific name
Byssoporia terrestris
Author
(DC.) M.J. Larsen & Zak
Common names
Jordporing
Spindelkjuke
Karikekääpä
IUCN Specialist Group
Mushroom, Bracket and Puffball
Kingdom
Fungi
Phylum
Basidiomycota
Class
Agaricomycetes
Order
Atheliales
Family
Atheliaceae
Assessment status
Published
Assessment date
2024-08-04
IUCN Red List Category
LC
Assessors
Susana C. Gonçalves; Susana Cunha (RBG Kew and University of Coimbrta, Portugal)
Reviewers
Anders Dahlberg (Swedish Species Information Centre, Uppsala / IUCN SSC Cup-fungus, Truffle and Ally Specialist Group); Gregory Mueller (Chicago Botanic Garden / IUCN SSC Mushroom, Bracket and Puffball Specialist Group)

Assessment Notes

The content on this page is fetched from The IUCN Red List of Threatened Species: https://www.iucnredlist.org/species/265979451/277422023

Justification

Byssoporia terrestris is an ectomycorrhizal polypore with resupinate sporocarps, with a wide distribution in the northern hemisphere, a large population size and range of hosts. It is not considered to be declingin rapidly and is therefore assessed as Least Concern (LC).

Taxonomic notes

This is the only species in the Byssoporia genus, established based on morphological characteristics (Larsen and Zak 1978).

Geographic range

This species has a wide distribution in the Northern Hemisphere, mainly recorded in Europe and North America, but has also records from Asia (Türkiye and Far East Russia).

Population and Trends

Byssoporia terrestris is widely distributed with many records from the Northern Hemisphere (GBIF.org 2023). Being a species forming inconspicous corticoid sporocarps, it is commonly overlooked. Since the species is usually found in old forests, it may be in decline due to a decrease in area/quality of habitat. However, this is difficult to quantify and is not expected to be a considerable decline at a global scale given the large area of potential habitat and range of hosts.

Population Trend: Unknown

Habitat and Ecology

Byssoporia terrestris is a common and widespread ectomycorrhizal fungus forming resupinate sporocarps on branches and rotten wood, usually in old forests. It is mycorrhizal with multiple conifers and broadleaved trees (Larsen and Zak 1977, SLU Artdatabanken 2020, Brandrud et al. 2021). Despite being widely distributed, it is neither encountered frequently as sporocarps nor as DNA-identified mycorrhiza or eDNA.

Threats

No significant threats have been identified at a global scale, though the clearing of old forests in some regions may temporarily present a threat to local subpopulations of Byssoporia terrestris (SLU Artdatabanken 2020).

Conservation Actions

No specific conservation measures are needed. It is nationally Red Listed as Least Concern in Finland, Norway and Sweden (Hyvärinen et al. 2019, SLU Artdatabanken 2020, Artsdatabanken 2021).

Source and Citation

Cunha, S.P. & Gonçalves, S.C. 2025. Byssoporia terrestris (amended version of 2025 assessment). The IUCN Red List of Threatened Species 2025: e.T265979451A277422023. Accessed on 25 November 2025.

Country occurrence