Macrolepiota macilenta and M. pallida, two new species from North America

Abstract

Two new species of Macrolepiota, viz. Macrolepiota macilenta and M. pallida, are formally described from eastern and midwestern North America based on molecular data, morphological characters and geographic distribution pattern. They are found in summer and fall in hardwood forests including Fagaceae (Quercus, Fagus) and in grassy clearings and nutrient-rich soils. They can be distinguished morphologically from one another by their general colours, spore size, pileus covering structure and shape of the cheilocystidia. Photographs of the species and of their micromorphologicalcharacters are provided.