It is a monotypic genus, containing the single crust fungus species Roseograndinia rosea, recorded from tropical east Africa and from New Zealand.
Paul Christoph Hennings originally described Grandinia rosea in 1905, from collections made in Usambara, a mountain range in northeastern Tanzania.
Microscopic characteristics include the lack of clamp connections in the hyphae, and the absence of cystidia.
The basidia (spore-bearing cells) are narrowly club shaped to tubular, and measure 25–30 by 5 μm.
[3] Roseograndinia rosea is a white rot fungus that grows on the bark on woody substrates.