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Type: Article
Published: 2021-03-31
Page range: 59–74
Abstract views: 30
PDF downloaded: 1

Marasmius tricystidiatus sp. nov. (Agaricales, Marasmiaceae) and its morphological and phylogenetic relationship with Marasmius jalapensis

Instituto de Botánica del Nordeste
Instituto de Botánica del Nordeste, IBONE (UNNE–CONICET). Sargento Cabral 2131, CC 209 Corrientes Capital, CP 3400, Argentina. Departamento de Biología, Facultad de Ciencias Exactas y Naturales y Agrimensura, Universidad Nacional del Nordeste. Av. Libertad 5470, Corrientes Capital, CP 3400, Argentina.
Instituto de Botánica del Nordeste, IBONE (UNNE–CONICET). Sargento Cabral 2131, CC 209 Corrientes Capital, CP 3400, Argentina.
Departamento de Biología, Facultad de Ciencias Exactas y Naturales, Universidad Nacional de Asunción, Campus Universitario, San Lorenzo, Paraguay.
Facultad de Ciencias Agrarias, Universidad Nacional del Nordeste. Sargento Cabral 2131, Corrientes Capital, CP 3400, Argentina.
Instituto de Botánica del Nordeste, IBONE (UNNE–CONICET). Sargento Cabral 2131, CC 209 Corrientes Capital, CP 3400, Argentina. Departamento de Biología, Facultad de Ciencias Exactas y Naturales y Agrimensura, Universidad Nacional del Nordeste. Av. Libertad 5470, Corrientes Capital, CP 3400, Argentina.
diversity Globulares Sicci Spinulosi taxonomy Fungi

Abstract

Morphological and phylogenetic analyses were performed on recently collected Marasmius specimens including specimens previously determined as Marasmius jalapensis in northern Argentina and Paraguay. A description of a new species for northern Argentina and Colombia and a new morphological delimitation of M. jalapensis with a more restricted distribution range are proposed. Marasmius tricystidiatus sp. nov. is characterised by its yellowish and slightly sulcate pileus, medium-sized basidiomata, setae in all tissues and cheilocystidia of three types, viz., Siccus-type broom cells, cheilosetae, and transitional elements; M. jalapensis, the closest species, is similar in pileus coloration and presence of setoid cystidia in all tissues, but mainly differs in having only cheilosetae and broader basidiospores on average. Both species are closely related and belong to sect. Globulares subsect. Leonini, but the relationships within the latter still must be resolved.