Osteina is a fungal genus in the family Dacryobolaceae.
Taxonomy The genus was circumscribed by mycologist Marinus Anton Donk in 1966, with Polyporus obductus as the type species.
Catalogue of Life lists 3 accepted species: Osteina obducta (Berk.) Donk Osteina rhodophila (Spirin & Zmitr.) Bernicchia & Gorjón Osteina undosa (Peck) Zmitr.
Description Osteina is characterized by fruit bodies that are sessile to stipitate, which are bone hard when dry. It has a monomitic hyphal system, containing only generative hyphae with clamps. The spores are hyaline and thin-walled, and are inamyloid and acyanophilic. Osteina causes a brown rot in gymnosperm wood.
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