Nemania effusa is a species of ascomycete fungus in the family Xylariaceae.

It is often found living on the dead bark of willow trees.

[2] The species was originally named Hypoxylon effusum by German botanist Theodor Rudolph Joseph Nitschke in 1867;[3] Zdeněk Pouzar transferred it to Nemania in 1985.

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