Porina monilisidiata is a species of corticolous (bark-dwelling), crustose lichen in the family Porinaceae,[1] first described in 2016.

This species is characterised by its shiny, olive-green thallus with numerous isidia and low conical ascomata.

The type specimen was collected in the Sinharaja Forest Reserve, Sri Lanka, on the bark of a tree on 17 February 2015.

[2] The thallus of Porina monilisidiata is corticate, smooth or slightly rugulose, covering areas up to 10 cm (4 in) in diameter, shiny, continuous, and thin.

[2] This species is found on trees in wet lowland tropical rainforests and at the time of its publication, was known only from Sri Lanka.