Marasmius tricystidiatus sp. nov. (Agaricales, Marasmiaceae) and the morphological and phylogenetic relationship with the close species Marasmius jalapensis
RAMIREZ NATALIA; NIVEIRO, NICOLÁS; SALVADOR-MONTOYA, CARLOS ALBERTO; PIRIS DA MOTA, FATIMA; PÉREZ, LAURA; POPOFF, ORLANDO FABIÁN
A thorough morphological and phylogenetic analysis of recently collected Marasmius specimens including specimens previously determined as Marasmius jalapensis in Northern Argentina and Paraguay was made. 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 close 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.