Common Black Earth Tongue
Geoglossum simile
The Common Black Earth Tongue is a distinctive club-shaped fungus with a dark brown to black, spatula-like fruiting body that emerges from soil in grasslands and meadows. These saprophytic fungi play a crucial ecological role in nutrient cycling by decomposing organic matter in soil and forming associations with plant roots.
Photo: iNaturalist: (c) Django Grootmyers, some rights reserved (CC BY-SA), uploaded by Django Grootmyers
Taxonomy & Classification
Kingdom
Fungi
Phylum
Ascomycota
Class
Geoglossomycetes
Order
Geoglossales
Family
Geoglossaceae
Genus
Geoglossum
Common Black Earth Tongue belongs to the family Geoglossaceae, order Geoglossales, within the Geoglossomycetes class.
Species Profile
The Common Black Earth Tongue is a distinctive club-shaped fungus with a dark brown to black, spatula-like fruiting body that emerges from soil in grasslands and meadows. These saprophytic fungi play a crucial ecological role in nutrient cycling by decomposing organic matter in soil and forming associations with plant roots. The species typically grows 2-8 cm tall with a smooth, tongue-like cap that distinguishes it from other earth tongue species.
The Common Black Earth Tongue is declining primarily due to habitat loss and degradation of its specialized grassland ecosystems. Agricultural intensification, including increased fertilizer use and conversion of semi-natural grasslands to intensive farming, has severely reduced suitable habitat. Climate change and atmospheric nitrogen deposition further threaten the nutrient-poor grassland conditions this species requires.
Key Facts
Habitat & Distribution
This species thrives in nutrient-poor, calcareous grasslands, old pastures, and chalk downs where it grows among short grasses and mosses. It particularly favors undisturbed, species-rich meadows with thin soils that have been maintained by traditional low-intensity grazing practices.
Threats
IUCN Red List: Endangered
The Common Black Earth Tongue is declining primarily due to habitat loss and degradation of its specialized grassland ecosystems. Agricultural intensification, including increased fertilizer use and conversion of semi-natural grasslands to intensive farming, has severely reduced suitable habitat. Climate change and atmospheric nitrogen deposition further threaten the nutrient-poor grassland conditions this species requires.
Agricultural intensification and grassland conversion
Fertilizer use and nutrient enrichment
Atmospheric nitrogen deposition
Climate change
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). Common Black Earth Tongue (Geoglossum simile). SpeciesRadar: Intelligence for Earth's Biodiversity. Available at: https://speciesradar.org/species/common-black-earth-tongue