Rhodocybe gemina
Scientific classification Edit this classification
Domain: Eukaryota
Kingdom: Fungi
Division: Basidiomycota
Class: Agaricomycetes
Order: Agaricales
Family: Entolomataceae
Genus: Rhodocybe
Species:
R. gemina
Binomial name
Rhodocybe gemina
(Paulet) Kuyper & Noordel. (1987)
Synonyms

Hypophyllum geminum Paulet (1793)
Agaricus geminus (Paulet) Fr. (1838)
Gyrophila gemina (Paulet) Quél. (1886)
Tricholoma geminum (Paulet) Sacc. (1887)
Clitopilus geminus (Paulet) Noordel. & Co-David (2009)


Rhodocybe gemina is a species of fungus in the family Entolomataceae. It has the recommended English name of tan pinkgill[1] and produces agaricoid basidiocarps (fruit bodies) that are fleshy and cream when young, becoming brownish when mature.

Taxonomy

The species was originally named Hypophyllum geminum in 1793 by French mycologist Jean-Jacques Paulet and transferred to the genus Rhodocybe in 1987.[2] Prior to this, the species was commonly known as Rhodocybe truncata (Schaeff.) Singer, based on Agaricus truncatus described by Jacob Christian Schäffer in 1774. No original specimen of Schäffer's species exists, however, and the original description is so ambiguous that it has also been referred to the genus Hebeloma (as Hebeloma truncatum (Schaeff.) P. Kumm.) by some authorities.[2] Rhodocybe truncata is now considered a nomen dubium and is no longer in use.[3]

In 2009, as a result of molecular research, based on cladistic analysis of DNA sequences, CoDavid et al. included Rhodocybe gemina in their expanded concept of Clitopilus.[4] Subsequent research showed, however, that Rhodocybe is a monophyletic (natural) genus and that R. gemina belongs within it.[5]

Description

The skin of the cap is matt, not slimy or shiny. The cap is up to 120 mm wide, at first somewhat umbonate, later becoming irregular and flattened, and brownish ochre to pinkish ochre. The gills are adnate to decurrent in attachment and the stem is whitish – often lighter than the gills and relatively short, but always lacking a veil or volva. The spore print is flesh-coloured to salmon-pink. Microscopically the spores are angular when viewed on end; when viewed from the side they are irregularly warted.[3]

A saprotrophic species, it generally grows in woodlands, both broadleaved and occasionally coniferous, but also in grassland and scrub.[3]


References

  1. ↑ Holden L. "English names for fungi - April 2022". British Mycological Society. Retrieved 2023-05-29.
  2. 1 2 Noordeloos ME, Kuyper TW (1987). "Notulae ad Floram agaricinam neerlandicam — XIV. A noemnclatural note on Rhodocybe truncata". Persoonia. 13 (3): 379–380.
  3. 1 2 3 Mattock G (2005). "Rhodocybe gemina – a good year in Hampshire for a rare species". Field Mycology. 6 (2): 65–67. doi:10.1016/S1468-1641(10)60306-4.
  4. ↑ D. Co-David; D. Langeveld; M.E. Noordeloos (Nov 2009). "Molecular phylogeny and spore evolution of Entolomataceae" (PDF). Persoonia. 23 (2): 147–176. doi:10.3767/003158509x480944. PMC 2802732. PMID 20198166. Archived from the original (PDF) on 2011-07-27.
  5. ↑ Kluting KL, Baroni TJ, Bergemann SE (2014). "Toward a stable classification of genera within the Entolomataceae: a phylogenetic re-evaluation of the Rhodocybe-Clitopilus clade". Mycologia. 106 (6): 1127–42. doi:10.3852/13-270. PMID 24987124. S2CID 40696041.
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