René Léopold Alix Ghislain Jules Steyaert

Pestalotiopsis is a genus of ascomycete fungi in the Sporocadaceae family.

Humphreya is a genus of four species of polypore fungi in the family Ganodermataceae. The genus was circumscribed by Belgian mycologist René Léopold Steyaert in 1972. He proposed Humphreya as a genus segregate from Ganoderma, typified by Ganoderma lloydi Pat. & Har., and included Ganoderma coffeatum and the newly described Humphreya endertii. H. eminii was transferred to the genus (from Ganoderma) by Leif Ryvarden in 1980. Humphreya differs from Ganoderma by the velvety cap and stipe surfaces of its fruit bodies. Microscopically, the spores of Humphreya feature a crested endosporium (the

Haddowia is a genus of polypore fungi in the family Ganodermataceae. The genus was circumscribed by Belgian mycologist René Léopold Steyaert in 1972, with Haddowia longipes (previously Amauroderma) as the type species. The genus name honors William Robert Haddow, "in view of his careful studies in the genus Ganoderma.

Truncatella hartigii is a species of parasitic fungus in the family Bartaliniaceae, first described by Karl von Tubeuf in 1888, and given its current name by René Léopold Steyaert in 1949. It is a parasite of pine needles. It is morphologically similar to Pestalotiopsis funerea with differences in their conidia. It shows significant antibacterial activity, especially against Enterococcus faecalis.

Pestalotiopsis guepini is a fungal plant pathogen infecting rhododendrons and camellia.

Truncatella laurocerasi is a pathogen the primarily infects strawberries.

Pestalotiopsis versicolor is a plant pathogen infecting avocados.

Pestalotiopsis palmarum is the causative agent of a fungal disease of bananas, coconut and Date palms . The fungus causes leaf spots, petiole/rachis blights and sometimes bud rot of palms. Unlike other leaf spot and blight diseases, Pestalotiopsis palmarun attacks all parts of the leaf from the base to the tip. Whereas most diseases only infect the leaf blade or the leaf petiole.

Pestalotiopsis mangiferae is a fungal plant pathogen infecting mangoes.

Pestalotiopsis disseminata is a fungal plant pathogen infecting bananas.

Pestalotiopsis adusta is a fungal plant pathogen infecting tea and avocados.

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The fungal genus Truncatella in the family Sporocadaceae, and in the Amphisphaeriales order, includes plant pathogens such as Truncatella laurocerasi. Truncatella angustata has been linked with grapevine trunk disease in northern Iran. Neopestalotiopsis, Pestalotiopsis and Truncatella fungal species (all in family Sporocadaceae) are associated with grapevine trunk diseases in France. It also causes canker and twig dieback in blueberry plants.

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