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Butyriboletus loyo

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A large, Nothofagus-associated bolete native to central and southern Chile, where it has a documented Mapuche food tradition and local market use. It is listed as Endangered; historical edibility is not a reason to collect it.

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A single loyo bolete with a broad burgundy cap, yellow pores and stout yellow stem against warm ivory.

Name and identity

The Chilean bolete was described as Boletus loyo and is now classified as Butyriboletus loyo (Phillippi) Mikšík, a combination published in 2015. Chile's species record lists Boletus loyus Espinosa as a synonym. Field accounts describe a very large, dark red to burgundy cap, yellow pores and yellow flesh that can blue when cut or bruised, on a stout stem with a red base. It grows from soil in association with Nothofagus beech trees. These are source descriptions, not a field-identification or food-safety key. [Species Fungorum](https://www.speciesfungorum.org/names/Synonymy.asp?RecordId=551722); [Riquelme et al. 2019](https://revistas.uv.cl/index.php/Bolmicol/article/view/1754); [Chilean Environment Ministry species record](https://clasificacionespecies.mma.gob.cl/wp-content/uploads/2019/10/Boletus_loyo_11RCE_02_PAC.pdf).

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Forest, range and season

This ectomycorrhizal fungus lives with Nothofagus, especially N. obliqua and N. dombeyi, and also has records with N. alpina and N. glauca. The Chilean assessment documents it from Maule, Biobío, Araucanía and Los Ríos, with O'Higgins and Los Lagos listed as uncertain; the 2019 taxonomic review describes Chilean populations across the Nothofagus belt. The assessment gives late summer through autumn, approximately March to May, while an earlier Chilean field account gives May to July. These regional observations support a broad austral-autumn season, not fixed dates for every forest. [Chilean Environment Ministry species record](https://clasificacionespecies.mma.gob.cl/wp-content/uploads/2019/10/Boletus_loyo_11RCE_02_PAC.pdf); [Riquelme et al. 2019](https://revistas.uv.cl/index.php/Bolmicol/article/view/1754); [CONAF field guide](https://investigacion.conaf.cl/archivos/repositorio_documento/2018/11/002_2011-LIBRO.pdf).

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Food use and cultural context

A 1915 Chilean natural-history account records loyo as edible and highly esteemed by local inhabitants. Later Chilean research describes it as a culturally important Mapuche food mushroom; an INFOR species account notes consumption among Indigenous communities from Biobío southward and recognition by Huilliche communities in San Juan de la Costa. Government and forestry sources document fresh local-market sales, mainly in Biobío and Araucanía, alongside domestic use and wider trade. The evidence establishes food use, but the sources reviewed here do not establish one standard preparation method, so none is prescribed. [Espinosa 1915](https://publicaciones.mnhn.gob.cl/668/w3-article-64280.html); [IUCN assessment, 2019](https://www.iucnredlist.org/species/75099337/75099440); [INFOR 2023](https://bibliotecadigital.infor.cl/entities/publication/99094540-c04f-4d92-af9b-2e1b67d7a27d); [Chilean Environment Ministry species record](https://clasificacionespecies.mma.gob.cl/wp-content/uploads/2019/10/Boletus_loyo_11RCE_02_PAC.pdf).

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Conservation and limits

Chile's official species list and the 2019 IUCN assessment classify loyo as Endangered. The IUCN assessment identifies overharvesting and loss or fragmentation of Nothofagus forest as threats; the Chilean assessment records habitat loss and exploitation concerns. Because the mushroom is threatened, its food history should be read as cultural documentation rather than a prompt to harvest. Neither the edible-use record nor the morphology summary substitutes for expert identification or a species-specific toxicological assessment. [Chile Environment Ministry final classification list](https://clasificacionespecies.mma.gob.cl/procesos-de-clasificacion/11o-proceso-de-clasificacion-de-especies-2014/listado-de-especies-y-fichas-finales-11o-proceso-rce/); [IUCN assessment, 2019](https://www.iucnredlist.org/species/75099337/75099440); [Chilean Environment Ministry species record](https://clasificacionespecies.mma.gob.cl/wp-content/uploads/2019/10/Boletus_loyo_11RCE_02_PAC.pdf).

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Places

Chile

Historical attestation · Country evidence

The national association is based on documented records and use; it does not imply continuous occurrence across the country.

See Chileon the mapLocation source 1 → · Location source 2 →

Región del Biobío

Documented use · Region evidence

Official species account documents local fresh-market sales, mainly in Biobío and Araucanía.

See Región del Biobíoon the mapLocation source 1 →

Región de La Araucanía

Documented use · Region evidence

Official species account documents local fresh-market sales, mainly in Biobío and Araucanía.

See Región de La Araucaníaon the mapLocation source 1 →

Región de Los Ríos

Traditional use · Region evidence

INFOR reports that its 2018–2021 food-mushroom research project was conducted in Panguipulli, Los Ríos. This is a documented research area, not a claim of uniform use throughout the region.

See Región de Los Ríoson the mapLocation source 1 →

Región de Los Lagos

Traditional use · Region evidence

The INFOR 2023 source records Huilliche recognition in San Juan de la Costa (Osorno Province). The Chilean species assessment lists Los Lagos occurrence as uncertain; cultural use and species distribution evidence are kept distinct.

See Región de Los Lagoson the mapLocation source 1 → · Location source 2 →

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