Arrhenia genus of fungi in the family Hygrophoraceae. Arrhenia also includes species formerly placed in the genera Leptoglossum and Phaeotellus and the lectotype species itself has an unusual growth form (discussed below) that would not normally be called agaricoid. All of the species grow in association with photosynthetic cryptogams such as mosses , including peat moss, and alga scums on decaying wood, and soil crusts consisting of mixes of such organisms. Typically the fruitbodies of Arrhenia species are grey to black or blackish brown, being pigmented by incrusting melanized pigments on the hyphae .
Arrhenia was named for the Swedish botanist Johan Peter Arrhenius.
As of February 2016, Index Fungorum accepts 50 species of Arrhenia :
A. acerosa (Fr.) Kühner 1980 – EuropeA. alnetorum (Singer) Redhead 1984A. andina (Corner) Redhead, Lutzoni, Moncalvo & Vilgalys 2002A. antarctica (Singer) Redhead, Lutzoni, Moncalvo & Vilgalys 2002 – Antarctica; South GeorgiaA. auriscalpium (Fr.) Fr. 1849 – AntarcticaA. australis (Cleland) Grgur. 1997A. baeospora (Singer) Redhead, Lutzoni, Moncalvo & Vilgalys 2002 – Great BritainA. chilensis (Mont.) Redhead, Lutzoni, Moncalvo & Vilgalys 2002A. chlorocyanea (Pat.) Redhead, Lutzoni, Moncalvo & Vilgalys 2002 – Europe; North AmericaA. cupuliformis Henn. 1895A. discorosea (Pilát) Zvyagina, Alexandrova & Bulyonkova 2015A. eburnea Barrasa & V.J.Rico 2003A. elegans (Pers.) Redhead, Lutzoni, Moncalvo & Vilgalys 2002A. epichysium (Pers.) Redhead, Lutzoni, Moncalvo & Vilgalys 2002 – Great BritainA. fissa (Leyss.) Redhead 1984A. glauca (Batsch) Bon & Courtec. 1987A. griseopallida (Desm.) Watling 1989 – Great BritainA. hohensis (A.H.Sm.) Redhead, Lutzoni, Moncalvo & Vilgalys 2002A. latispora (J.Favre) Bon & Courtec. 1987A. lobata (Pers.) Kühner & Lamoure ex Redhead 1984 – EuropeA. lundellii (Pilát) Redhead, Lutzoni, Moncalvo & Vilgalys 2002A. luteopallida (Kuyper & Hauskn.) Barrasa & V.J.Rico 2003A. obatra (J.Favre) Redhead, Lutzoni, Moncalvo & Vilgalys 2002 – EuropeA. obscurata (D.A.Reid) Redhead, Lutzoni, Moncalvo & Vilgalys 2002 – Great BritainA. omnivora (Agerer) Redhead, Lutzoni, Moncalvo & Vilgalys 2002 – AntarticaA. onisca (Fr.) Redhead, Lutzoni, Moncalvo & Vilgalys 2002 – EuropeA. parvivelutina (Clémençon & Irlet) Redhead, Lutzoni, Moncalvo & Vilgalys 2002A. pauxilla (Clémençon) Redhead, Lutzoni, Moncalvo & Vilgalys 2002A. peltigerina (Peck) Redhead, Lutzoni, Moncalvo & Vilgalys 2002 – Great BritainA. philonotis (Lasch) Redhead, Lutzoni, Moncalvo & Vilgalys 2002 – Great BritainA. pubescentipes (H.E.Bigelow) Redhead, Lutzoni, Moncalvo & Vilgalys 2002A. rainierensis (H.E.Bigelow) Redhead, Lutzoni, Moncalvo & Vilgalys 2002A. retiruga (Bull.) Redhead 1984 – EuropeA. rickenii (Hora) Watling 1989 – EuropeA. rigidipes (Lamoure) Redhead, Lutzoni, Moncalvo & Vilgalys 2002A. rustica (Fr.) Redhead, Lutzoni, Moncalvo & Vilgalys 2002 – EuropeA. salina (Høil.) Bon & Courtec. 1987A. spathulata (Fr.) Redhead 1984 – EuropeA. sphaerospora (Lamoure) Redhead, Lutzoni, Moncalvo & Vilgalys 2002A. sphagnicola (Berk.) Redhead, Lutzoni, Moncalvo & Vilgalys 2002 – EuropeA. stercoraria (Barrasa, Esteve-Rav. & Sánchez Nieto) Redhead, Lutzoni, Moncalvo & Vilgalys 2002A. subandina (Singer) P.M.Kirk 2014A. subglobispora (G.Moreno, Heykoop & E.Horak) Redhead, Lutzoni, Moncalvo & Vilgalys 2002A. subobscura (Singer) Redhead, Lutzoni, Moncalvo & Vilgalys 2002A. tabaresiana (Vila & Llimona) Vila 2009A. trigonospora (Lamoure) Redhead, Lutzoni, Moncalvo & Vilgalys 2002A. umbratillis (Fr.) Redhead, Lutzoni, Moncalvo & Vilgalys 2002 – Great BritainA. velutipes (P.D.Orton) Redhead, Lutzoni, Moncalvo & Vilgalys 2002 – Great BritainA. violaceoviridis (Courtec.) Courtec. 2008A. viridimammata (Pilát) Redhead, Lutzoni, Moncalvo & Vilgalys 2002A. volkertii (Murrill) Redhead, Lutzoni, Moncalvo & Vilgalys 2002
