Tricharia vainioi is a species of foliicolous lichen in the family Gomphillaceae.

It is widely distributed, having been recorded in Africa, Asia, Australia, Central and South America.

[1] Tricharia vainioi has sessile, dark brown apothecia that are either slightly constricted at the base or not at all.

In these locations, the lichen was growing on either Alpinia speciosa, Asplenium nidus, or Diospyros.

[2] In Costa Rica, Tricharia vainioi was one of 23 species of lichens found growing mainly on the pronotum, but also on the forewings of the shield mantis species Choeradodis rhombicollis and Choeradodis rhomboidea.