Phylloblastia bielczykiae is a species of foliicolous (leaf-dwelling) lichen in the family Verrucariaceae. Found in Bolivia, it was formally described as a new species in 2008 by lichenologists Adam Flakus and Robert Lücking. The type specimen was collected near lake Copaiba (José Ballivián Province, Beni Department); there, in an isolated island of lowland Amazon rainforest along a savanna, it was found growing on the leaves of a vascular plant. It is only known from the type locality. The species epithet honours the Polish lichenologist Urszula Bielczyk.
The lichen has an indistinct, crustose thallus with a mealy (farinose) to grainy (granulose) texture, and a pale yellowish-green to olivaceous colour. It is somewhat similar to Phylloblastia inconspicua, but has smaller ascospores (typically measuring 3–9 by 40–55 μm).