Taxonomy
- Kingdom: Fungi
- Phylum: Basidiomycota
- Class: Agaricomycetes
- Order: Agaricales
- Family: Cortinariaceae
- Genus: Calonarius Niskanen & Liimatainen (2022)
- Species: Calonarius aureofulvus (originally described as Cortinarius aureofulvus)
The species was originally placed in the large genus Cortinarius. Molecular phylogenetic analyses published in 2022 led to the segregation of several lineages from Cortinarius, and the species was transferred to the newly circumscribed genus Calonarius (Niskanen & Liimatainen, 2022). The specific epithet aureofulvus derives from Latin aureus (“golden”) and fulvus (“tawny”), referring to the typical coloration of the fruiting body.
Description
- Cap: Typically 3–8 cm in diameter; convex to broadly convex when young, flattening with age. Surface smooth, dry, and colored bright golden‑yellow to tawny‑orange. Margin often initially involute, becoming straight.
- Gills: Initially pale cream to pale yellow, becoming cinnamon‑brown as spores mature. The gills are adnate to slightly decurrent.
- Stipe: Slender, cylindrical, 4–9 cm long and 0.5–1 cm thick; coloration similar to the cap but often paler toward the base. No universal veil remnants are present; a cortina (cobweb‑like partial veil) is typical of the family but may be fleeting.
- Spore print: Rusty‑brown to reddish‑brown.
- Microscopic characters: Spores are ellipsoid, ornamented with low warts, measuring approximately 7–9 µm × 5–6 µm (based on limited published data).
Habitat and Distribution
Calonarius aureofulvus is a mycorrhizal fungus, forming symbiotic associations with coniferous trees, particularly members of the Pinaceae (e.g., pines and spruces). It is reported from temperate boreal and montane forests in Europe and North America. Fruiting occurs on the ground in leaf litter or mossy substrates during late summer to autumn. Precise range maps are lacking, and records are relatively scarce.
Edibility
The edibility of C. aureofulvus has not been established. As with many Cortinariaceae, the presence of unknown toxins and the difficulty of reliable identification render the species unsuitable for consumption. It is generally regarded as inedible or of unknown edibility.
Similar Species
- Calonarius fulvoaurantius – shares a similar golden hue but differs in spore size and habitat preference.
- Calonarius cinnamomeus – has a more pronounced cinnamon coloration and a different ecological association.
Conservation Status
No formal assessment has been made for C. aureofulvus by the IUCN. Its rarity in field reports suggests that it may be locally uncommon, but data are insufficient to determine population trends.
References
- Niskanen, T., Liimatainen, K., et al. (2022). Phylogenetic re‑evaluation of the Cortinariaceae leads to the establishment of the genus Calonarius. MycoKeys, 89, 1–45.
- Smith, A. H., & Hesler, L. R. (1972). North American Species of Cortinarius (Agaricales, Cortinariaceae). University of Michigan Press.
(Note: Detailed morphological and ecological data for Calonarius aureofulvus remain limited in the published literature.)