The genus Mesophellia, type of the family Mesophelliaceae, has been restudied in light of extensive recent collections. Most past species identifications in the genus have been erroneous, because past workers did not comprehensively study holotypes or fresh material. In this paper, the genus is divided into two subgenera: Mesophellia and Loculatae. Subgenus Mesophellia comprises 12 species, of which 8 are newly described here: M. angustispora, M. brevispora, M. clelandii, M. oleifera, M. pallidospora, M. pawa, M. rava and M. trabalis. Subgenus Loculatae comprises two species, both of which are newly described here: M. labyrinthina and M. westresii.
Re-examination of species ascribed to the genus Labyrinthomyces plus our collections of related undescribed taxa revealed three distinct morphological groups which we segregate at the generic level. All have globose to ellipsoid spores ornamented with amorphous, hyaline warts or ridges. Labyrinthomyces is retained as a monotypic genus characterised by a brown-tomentose peridium and paraphyses half as long as the asci. Dingleya contains six species (two newly described here) with tessellate-cracked to verrucose peridia. Reddellomyces has four species (one newly described) with white to pale brown, smooth peridia. The last two genera are known only from Australasia.*Part I, Aust. Syst. Bot., 1990, 3, 653–70.
Two new genera, Gummiglobus with two species and the monotypic Andebbia, are described as segregates from the genus Mesophellia. Both genera have minutely ornamented spores. The species of Gummiglobus, moreover, have columellae with wedge-shaped to digitate or strand-like projections that extend to the endocutis of the peridium and are embedded in a remarkable gummy tissue.
This paper describes two new genera of gastroid (truffle-like) Basidiomycotina. Royoungia boletoides is described from Cooloola, Queensland, and is tentatively assigned to the Boletales on the basis of sporocarp and spore morphology. Mycoamaranthus auriorbis is described from a number of collections from northern Queensland and is not placed in any currently described family.* Part II, Aust. Syst. Bot., 1992, 5, 597–611.
Malajczukia, a new genus of truffle-like fungi, is described along with six new species (M. amicorum, M. fusispora, M. karrialis, M. spumoidea, M. tropica and M. viridigleba) and two new combinations (M. ingratissima and M. novae-zelandiae). Malajczukia has the central glebal core separated from the peridial endocutis by radiate rows of narrow locules instead of by the capillitium and powdery spore mass that characterise the closely related genus Mesophellia. All have veins or nests of large, inflated cells in the central core, a feature absent in Mesophellia.* Part III, Aust. Syst. Bot., 1992, 5, 613–16.
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