R. atra R. lignicola R. undulata Rhizina is a genus of ascomycete fungi in the order Pezizales.

The genus was circumscribed by Elias Magnus Fries in his 1815 work Observationes mycologicae, with R. undulata as the type species.

[1] R. atra and R. lignicola were added to the genus in 1921 and 1925, respectively, by Australian botanist Leonard Rodway.

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