Michael A. Castellano

Phallomycetidae is a subclass of the class Agaricomycetes of fungi.

The Hysterangiales are an order of fungi in the class Agaricomycetes, subclass Phallomycetidae. According to one 2008 estimate, the order contains five families, 18 genera, and 114 species.

Horakiella is a genus of fungi within the Sclerodermataceae family that contains the two species H. clelandii and H. watarrkana. The genus name of Horakiella is in honour of Egon Horak (born 1937), an Austrian mycologist. The genus was circumscribed in 1992 by Michael A. Castellano and James Martin Trappe in Austral. Syst. Bot., vol.5, on page 641.

Descolea is a genus of fungi in the family Bolbitiaceae. Described by mycologist Rolf Singer in 1952, the widespread genus contains about 15 species. It was formerly placed in the family Cortinariaceae because of its limoniform basidiospores and its ectomycorrhizal lifestyle. A 2013 molecular phylogenetics study by Tóth et al. found it to be closely related to the genus Pholiotina The genus Pseudodescolea, erected for the single Descolea-like species Pseudodescolea lepiotiformis, was formerly considered distinct until a 1990 study found it to be a synonym of Descolea antarctica. The genus

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Trappea is a genus of truffle-like fungi in the family Trappeaceae. Species of Trappea have been found in China, Europe, and North America. The genus was circumscribed by Michael A. Castellano in Mycotaxon vol.38 on page 2 in 1990. The genus name of Trappea is in honour of James Martin Trappe (born 1931) is an American mycologist and expert in the field of North American truffle species.

Quadrispora is a genus of fungi in the family Cortinariaceae.

Mycoamaranthus is a genus of fungi in the family Boletaceae. The genus contains three species, found in Australasia, Africa, and Southeast Asia. The genus was circumscribed by Michael Angelo Castellano, James 'Jim' Martin Trappe and Nicholas Malajczuk in Austral. Syst. Bot. vol.5 (5) on page 613 1992. The genus name of Mycoamaranthus is in honour of Michael P. Amaranthus (fl. 1996–2012), who was an American botanist (mycology) and research biologist. He worked at the Forestry Sciences Laboratory in Seattle.

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Royoungia is a fungal genus in the family Boletaceae. This genus is represented by the type species Royoungia boletoides, which was found in Australia. In 2016, 5 more species were found in China. The genus was circumscribed by Michael Angelo Castellano, James Martin 'Jim' Trappe and Nicholas Malajczuk in Austral. Syst. Bot. vol.5 (5) on page 614 in 1992. The genus name of Royoungia is in honour of Roy Young, who was a plant collector of subterranean growing fungi. In 1988 he joined an Expedition in Queensland, Australia. This genus is characterized by the boletoid or gasteroid basidiomata.

Reddellomyces is a genus of truffle-like fungi in the Tuberaceae family. The genus, circumscribed in 1992, contains four species found in Australasia and the Mediterranean.

Hallingea is a genus of fungi in the family Gallaceaceae. It contains three species found in South America.

Gummiglobus is a genus of truffle-like fungi in the Mesophelliaceae family. The genus contains two Australian species described as new to science in 1996. The species, G. agglutinosporus and G. joyceae, "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".

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