Hygrophoropsis rufa is a species of fungus in the family Hygrophoropsidaceae. It is found in Europe, where it grows on woodchips or near conifer stumps.
| Hygrophoropsis rufa | |
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Scientific classification 
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| Domain: | Eukaryota |
| Kingdom: | Fungi |
| Division: | Basidiomycota |
| Class: | Agaricomycetes |
| Order: | Boletales |
| Family: | Hygrophoropsidaceae |
| Genus: | Hygrophoropsis |
| Species: | H. rufa
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| Binomial name | |
| Hygrophoropsis rufa (D.A.Reid) Knudsen (2008)
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| Synonyms | |
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Taxonomy
editOriginally described by Derek Reid in 1972 as a variety of Hygrophoropsis aurantiaca,[1] it was raised to distinct species status in 2008.[2] Molecular analysis of DNA sequences confirms its genetic uniqueness, and its status as sister species to H. aurantiaca.[3]
Description
editThe fruit body has an orange- to dark brown cap,[3] which is up to 10 cm (4 in) across. The stipe, flesh and decurrent gills are all orange. The gills are forked.[4] Hygrophoropsis rufa can have a penetrating ozone-like smell, reportedly reminiscent of an orchid species Oncidium ornithorhynchum or a photocopier.[5]
Spores of H. rufa are thick-walled and have an ellipsoid shape,[5] and measure 5.6–6.4 by 3.6–4.4 micrometres (μm).[3] They have a strongly dextrinoid staining reaction with Melzer's reagent (resulting in a reddish-brown colour), although not all spores will react. Microscopically, the cells of the cap cuticle are arranged in the form of a trichoderm, where the outermost hyphae emerge roughly parallel, like hairs, perpendicular to the cap surface. These hyphae are of three types: broad, thick-walled and hyaline (translucent); filiform (threadlike); or with granular golden-brown contents. In contrast, the cap cuticle of H. aurantiaca is arranged as a uniformly tangled cutis (with hyphae parallel to the pileus surface).[5]
Habitat and distribution
editA rare species, H. rufa has been recorded in the United Kingdom, Austria, Germany, and Denmark, although unconfirmed internet photos suggest a wider range that includes France and Slovakia.[3] A saprophytic fungus, it fruits on woodchips or near conifer stumps.[5]
References
edit- ^ Reid DA. (1972). Fungorum rariorum Icones coloratae. Vol. 6. Cramer. p. 5.
- ^ Knudsen H, Vesterhold J. (2008). Funga Nordica. Copenhagen: Nordsvamp. p. 913. ISBN 978-8798396130.
- ^ a b c d Holec J, Kolařík M. (2013). "Notes on the identity of Hygrophoropsis rufa (Basidiomycota, Boletales)" (PDF). Czech Mycology. 65 (1): 15–24. doi:10.33585/cmy.65102.
- ^ Assyov B. (2013). "Hygrophoropsis rufa (D.A. Reid) Knudsen". Boletales.com. Retrieved 16 November 2015.
- ^ a b c d Kibby G. (2012). "The Hygrophoropsis aurantiaca complex". Field Mycology. 13 (2): 43–50. doi:10.1016/j.fldmyc.2012.03.004.