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Issue: Vol. 769 No. 2: 11 Aug. 2026
Type: Article
Published: 2026-08-11
DOI: 10.11646/phytotaxa.769.2.1
Page range: 101-122
Abstract views: 84
PDF downloaded: 49

Four new species of Hygrocybe sect. Pseudofirmae (Hygrocybaceae, Agaricales) from the Cristalino basin in the Southern Brazilian Amazon

Divisão do Curso de Pós-graduação em Botânica; Instituto Nacional de Pesquisas da Amazônia (INPA); Av. André Araújo 2936; 69067-375; Manaus; AM; Brazil; Graduate Program in Biology of Fungi; Algae and Plants; Federal University of Santa Catarina (UFSC); Campus Universitário Reitor João David Ferreira Lima; s/n; 88040-900; Florianopolis; Brazil
Department of Plant Pathology and Odum School of Ecology; University of Georgia; Athens; GA 30602; United States
Department of Ecology and Evolutionary Biology; University of Toronto; 25 Willcocks Street; Toronto; ON M5S 3B2; Canada; Department of Natural History; Royal Ontario Museum; 100 Queens Park; Toronto; ON M5S 2C6; Canada
Department of Ecology and Evolutionary Biology; University of Toronto; 25 Willcocks Street; Toronto; ON M5S 3B2; Canada
Graduate Program in Biology of Fungi; Algae and Plants; Federal University of Santa Catarina (UFSC); Campus Universitário Reitor João David Ferreira Lima; s/n; 88040-900; Florianopolis; Brazil
Divisão do Curso de Pós-graduação em Botânica; Instituto Nacional de Pesquisas da Amazônia (INPA); Av. André Araújo 2936; 69067-375; Manaus; AM; Brazil; Laboratório de Patologia da Madeira; Coordenação de Tecnologia e Inovação (COTEI); Instituto Nacional de Pesquisas da Amazônia (INPA); Av. André Araújo 2936; 69067-375; Manaus; AM; Brazil
Fungi Funga ITS Mato Grosso phylogeny taxonomy

Abstract

Hygrocybe subgen. Hygrocybe sect. Pseudofirmae, includes tropical species with dimorphic basidiospores and basidia, and an often perforated pileus. Field expeditions in the Cristalino basin in the Southern Brazilian Amazon revealed four new species of Hygrocybe sect. Pseudofirmae: Hygrocybe cristalinoensis, forming entirely deep green basidiomes, with a convex-umbilicate, perforated pileus and whitish fringed margin; H. viridilacerata, characterized by basidiomes with green, umbonate pileus that is perforated at the centre, whitish lamellae and predominantly 2-spored microbasidia; H. pegleri, characterized by a squamulose pileus and a long stipe (> 100 mm); and H. vinaceosquamulosa, characterized by a squamulose, purple to pink pileus, pale yellow to pinkish lamellae and oblong to cylindrical macrospores with a middle constriction. These new species are proposed based on combined morphological and ITS sequence data. Phylogenetic analyses revealed the placement and uniqueness of the new species in the sect. Pseudofirmae clade, and their relationship with close species of the section. Descriptions, illustrations, and phylogenetic analyses results for the new species are provided. In addition, the new species are compared with closely related taxa.

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How to Cite

Cardoso, J.S., Lodge, D.J., Moncalvo, J.-M., Margaritescu, S., Neves, M.A. & Oliveira, J.J.S. (2026) Four new species of Hygrocybe sect. Pseudofirmae (Hygrocybaceae, Agaricales) from the Cristalino basin in the Southern Brazilian Amazon. Phytotaxa 769 (2): 101–122. https://doi.org/10.11646/phytotaxa.769.2.1