Arrhenia

Fungalpedia – Note 332, Arrhenia

Citation if using this entry: Sysouphanthong et al. 2024 (in prep) – Fungalpedia Basidiomycota 3.

Index Fungorum, Facesoffungi, MycoBank, GenBank, Fig. 1

Classification: Hygrophoraceae, Agaricales, Agaricomycetes, Agaricomycotina, Basidiomycota, Fungi

Arrhenia is a saprobic genus, belongs to the Hygrophoraceae Lotsy., consisting 36 species worldwide, and Arrhenia auriscalpium is considered as the type species (Lodge et al. 2014, He et al. 2018, Kalichman et al. 2020). Morphologically, Arrhenia is characterized by various shape of basidiomata from pleurotelloid to omphalinoid, various shapes of pileus from nutants to infundibuliform, various shapes of gills (flat, wavy, wrinkled, gilled), and absent to present stipe with eccentric to central attachments, hyaline inamyloid basidiospores, absence of pleulocystidia, precence or absence of cheilocystidia, mostly cutis pileipellis, and presence of clamp connections (Lodge et al. 2014, Desjardin & Perry 2017, Voitk et al. 2020, 2022). Most molecular studies have been based on ITS sequences and are currently placed in Hygrophoraceae (Lodge et al. 2014, Desjardin & Perry 2017, He et al. 2019, Kalichman et al. 2020, Voitk et al. 2020, 2022)

Type species: Arrhenia auriscalpium (Fr.) Fr.

Synonymy: Agaricus sect. Omphalia Pers., Agaricus trib. Omphalia (Pers.) Fr., Boehmia Raddi, Corniola Gray, Dictyolus Quél., Geotus Pilát & Svrček, Helotium Tode, Leptoglossum P. Karst., Leptotus P. Karst., Omphalia (Pers.) Gray, Phaeotellus Kühner & Lamoure, Phalomia Nieuwl.

Other accepted species: Species Fungorum – search Arrhenia

Figure 1 – Basidiomata of Arrhenia subglobisemen. a Basidiospores. b Basidia and basidioles. c Pileipellis. Scale bar = 10 μm. Redrawn from Blanco-Dios (2019).

References

Blanco-Dios JB. 2019 – Notes on the genus Arrhenia (I): Arrhenia pontevedrana, sp. nov. and A. subglobisemen (Agaricales, Basidiomycota), from the northwest of the Iberian Peninsula. Studies in Fungi 4(1), 185–191.

He MQ, Zhao RL, Hyde KD, Begerow D, Kemler M et al. 2019 – Notes, outline and divergence times of Basidiomycota. Fungal Diversity 99, 105–367.

Desjardin D, Perry B. 2017 – The gymnopoid fungi (Basidiomycota, Agaricales) from the Republic of Sa˜o Tome´ and Prı´ncipe, West Africa. Mycosphere 8(9), 1317–1391.

Kalichman J, Kirk, PM, Matheny PB. 2020 – A compendium of generic names of agarics and Agaricales. Taxon 69, 425–447.

Lodge DJ, Padamsee M, Matheny PB, Aime MC, Cantrell SA et al. 2013 – Molecular phylogeny, morphology, pigment chemistry and ecology in Hygrophoraceae (Agaricales). Fungal Diversity 64(1), 1–99.

Voitk A, Saar I, Lücking R, Moreau PA, Gilles Corriol G et al. 2020 – Surprising morphological, ecological and ITS sequence diversity in the Arrhenia acerosa complex (Basidiomycota: Agaricales: Hygrophoraceae). Sydowia 73, 133–162.

Voitk A, Saar I, Moncada B, Lickey EB. 2022 – Circumscription and typification of sphagnicolous omphalinoid species of Arrhenia (Hygrophoraceae) in Newfoundland and Labrador: three obligate and one facultative species. Mycological Progress 21(6), 57.

Entry by

Monthien Phonemany and Phongeun Sysouphanthong, Center of Excellence in Fungal Research, Mae Fah Luang University, Chiang Rai 57100, Thailand

(Edited by Kevin D Hyde, Samaneh Chaharmiri-Dokhaharani, & Achala R. Rathnayaka)

Published online 27 August 2024