Mario Rajchenberg

Rhizochaete is a genus of nine species of poroid crust fungi in the family Phanerochaetaceae. The genus is closely related to Phanerochaete. Aside from the widespread Rhizochaete radicata and the Asian species R. borneensis, most species of Rhizochaete fungi are found in North and South America.

Laetiporus portentosus is a species of polypore fungus in the family Fomitopsidaceae, found in South America, Australia, and in the North Island and northern South Island of New Zealand.

Ceriporia spissa is a species of fungus in the family Irpicaceae. It is a plant pathogen.

Ryvardenia is a genus of fungi in the family Polyporaceae. It contains two species, Ryvardenia campyla (Berk.) Rajchenb. (1994) and the type, Ryvardenia cretacea (Lloyd) Rajchenb. (1994), formerly placed in the genus Polyporus. Ryvardenia was circumscribed by Argentinian botanist Mario Rachenberg in 1994. The genus name of Ryvardenia is in honour of Leif Randulff Ryvarden (born 9 August 1935) who is a Norwegian mycologist. Molecular analysis of specimens from Argentina and Australia has shown that the species separate into two distinct clades that are each restricted biogeographically to one

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Skeletocutis stramentica is a species of poroid fungus in the family Polyporaceae that is found in New Zealand.

Skeletocutis nothofagi is a rare species of poroid crust fungus in the family Polyporaceae that is found in South America. It has been proposed for inclusion in the IUCN Red List of Threatened Species due to its highly restricted distribution and rare occurrence.

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Obba is a genus of three species of poroid, white rot crust fungi in the family Gelatoporiaceae. The genome sequence of the type species, O. rivulosa, was reported in 2016.

Microporellus iguazuensis is a species of poroid fungus in the family Polyporaceae. Found in South America, it was described as a new species in 1987 by mycologist Mario Rajchenberg. The type was collected in Misiones Province, Argentina, in the Iguazú National Park. Characteristics of the fungus include the fruit body comprising a lateral stipe and multiple fan- or spoon-shaped caps. Microscopic characters include the dimitic hyphal system, relatively large basidia measuring 23–31 by 8–9 μm, and large ellipsoid to egg-shaped spores measuring 7–9 by 5–6 μm. The fungus was redescribed 23 years

Cerrena cystidiata is a species of polypore in the genus Cerrena.

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Rhizochaete is a plant pathogen infecting planes, beeches, pines, oaks and other trees. It was first described as Corticium radicatum in 1895 by Paul Christoph Hennings. It was transferred to the genus, Rhizochaete by Alina Greslebin, Karen Nakasone and Mario Rajchenberg in 2004. Index Fungorum and Mycobank disagree on the current name of this taxon, with Mycobank asserting it to be Phanerochaete radicata and Index Fungorum, Rhizochaete radicata.

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