Pseudochapsa isidiifera is a species of corticolous (bark-dwelling), crustose lichen in the family Graphidaceae.

[2] Found in Brazil, it was first formally described as a new species in 2009 by the lichenologists Andreas Frisch and Klaus Kalb, as a member of the genus Chapsa.

The type specimen was collected by Kalb in 1980 in a rainforest along the Rio Negro, between 100 and 200 km (62 and 124 mi) upstream from Manaus.

The species epithet isidiifera refers to the presence of isidia on the thallus.

[3] Sittiporn Parnmen, Robert Lücking, and Helge Thorsten Lumbsch transferred the taxon to the genus Pseudochapsa in 2012.