Xenonectriella subimperspicua is a species of lichenicolous fungus in the family Nectriaceae.

[2] The fungus was first formally described by Carlo Luigi Spegazzini in 1898 as a member of genus Nectria.

Spegazzini collected the type specimen from South America, where it was growing on Punctelia constantimontium.

[5] Finally, Javier Etayo transferred the species to the genus Xenonectriella in 2017, giving it the binomial name by which it is currently known.

Infection by X. subimperspicua creates discoloured or bleached areas on the thallus of the host;[7] the perithecia of the fungus then become more readily visible.