Two Novel Species and Two New Records within the Genus Pluteus (Agaricomycetes, Agaricales) from Thailand

Abstract

Pluteus is a species-rich genus of saprotrophic agaric in the family Hispidoderma and is widely distributed in tropical, subtropical, and temperate areas throughout the world. Some species in this genus are threatened species according to the International Union for Conservation of Nature (IUCN) red list. During investigations of agarics in northern Thailand, four Pluteus taxa were collected. Morphological characteristics and phylogenic analyses were investigated. Two new species, namely P. chandrasikuliae and P. saisamorniae, were introduced. Pluteus chandrasikuliae is characterized by its relatively large basidiomata, an applanate, dark brown scaly pileus with a cutis pileipellis, two types of hymenial cystidia viz. irregular, as well as diverticulate cells and lageniform cells. In accordance with the phylogenetic results, this new species belongs to the Pluteus sect. Celluloderma. Moreover, P. saisamorniae is distinguished by a plano-convex with a broad umbo, dark brown minute squamules pileus, light brown lamellar edges, greyish orange stipe covered with brown granules, subglobose to broadly ellipsoid basidiospores, an abundance of thin- to thick-walled cheilocystidia and pleurocystidia, a trichohymeniderm pileipellis, and brown caulocystidia in clusters. Pluteus saisamorniae is a member of Pluteus sect. Hispidoderma. Additionally, P. losulus and P. septocystidiatus were discovered in Thailand for the first time and they belong to Pluteus sect. Pluteus. Comprehensive descriptions along with illustrations, photographs, phylogenetic trees showing their positions, and a comparison with phenetically similar taxa are provided.

Type studies of Pluteus (Fungi, Agaricales, Pluteaceae)

“…The three sections traditionally recognized morphologically are also reflected in phylogenetic analysis (Menolli et al, 2010;Justo et al, 2011a, b;Justo et al, 2014;Menolli et al, 2015a, b;Malysheva et al, 2016;Kaygusuz et al, 2019). Also, various works have included molecular analysis to clarify the taxonomic position of new records and description of species in the genus Pluteus; for example Banerjee & Sundberg (1995), Rodríguez et al (2009Rodríguez et al ( , 2010, Vizzini & Ercole (2011), Menolli et al (2014), Hosen et al (2018Hosen et al ( , 2019, Ferisin et al (2019), Ševčíková et al (2020, 2021), Malysheva et al (2020), Altaf et al (2022), Nopparat et al (2022).…”

Holarctic Species in the Pluteus romellii Clade. Five New Species Described and Old Names Reassessed

“…This genus currently includes about five hundred accepted species [ 5 ], but a lot of them need taxonomic revision using modern phylogenetic methods. Pluteus species are widely distributed in Holarctic [ 6 , 7 , 8 , 9 , 10 , 11 , 12 , 13 , 14 , 15 , 16 , 17 , 18 , 19 , 20 , 21 , 22 , 23 , 24 , 25 , 26 , 27 , 28 , 29 , 30 ], Neotropical [ 31 , 32 , 33 , 34 , 35 , 36 , 37 , 38 ], Paleotropical [ 39 , 40 , 41 , 42 , 43 , 44 , 45 , 46 ] and Austral ecosystems [ 47 , 48 , 49 ]. The genus has traditionally been subdivided into morphological groups (sections, subsections) according to the characteristics of the hymenial cystidia and the type of pileipellis [ 3 , 22 , 23 , 32 ].…”