Studies on Marasmius from Eastern North America. III. Marasmius Brevipes and Micromphale Sect. Rhizomorphigena

ABSTRACT

Micromphale westii, the type species of Micromphale sect. Rhizomorphigena, is considered a synonym of Marasmius brevipes. Micromphale sect. Rhizomorphigena is reevaluated utilizing pileipellis and stipe tissue morphology and transferred to Marasmius, where it is allied with sect. Androsacei. Micromphale is redefined and considered to comprise two sections, Micromphale and Perforantia. Type specimens of two previously linked species were reexamined. Marasmius porphyreticus is placed in sect. Rhizomorphigena. Arrhenia goossensiae is redescribed, and Marasmiellus usambarensis, from Tanzania, is described as a new species. All taxa are illustrated and compared with phenetically similar taxa.

Key Words:

• taxonomy
• Micromphale
• Marasmius