Some genera of Geoglossaceae, characterized by colourless spores and positive iodine reaction of the ascus pore, are compared with respect to the structure of the stipe. Ochroglossum is reduced to the synonymy of Microglossum. Mitrula is regarded as a monotypic genus. The generic name Heyderia is restored. Thuemenidium is reintroduced to replace Corynetes. Nothomitra is proposed as a new genus to accomodate N. cinnamomea, a new species.