Agaricales of the Hawaiian Islands 9. Five new white-spored species from native montane wet forests

Five new species of white-spored agarics are described from native montane wet forests in the Hawaiian Islands as follows: Callistosporium vinosobrunneum, Marasmiellus hapuuarum, Marasmius koae, Mycena marasmielloides, Pleurogbella ohiae. Comprehensive descriptions, illustrations and comparisons with phenetically similar species are provided. An itemization of the 24 known putatively endemic agarics described from this unique habitat is provided.