The type specimen was collected between Jaciara and Serra de São Vicente [pt], Mato Grosso, Brazil, on tree bark in Cerrado at an altitude of 750 m (2,460 ft).

[2] The thallus of Rinodina densisidiata originates as glossy brown, thin areoles that coalesce and become densely covered by a 0.4–0.9 mm thick-layer of isidia.

Isidia are cylindrical, corticate, irregularly sparingly branched, completely dark brown, glossy, approximately 30–50 μm thick and up to 0.9 mm long.

Apothecia (fruiting bodies) are stipitate, 0.4–0.7 mm in diameter, with a dark brown, flat to convex, dull disc.

[2] Rinodina densisidiata is found on tree bark in the Cerrado biome, and at the time of its original publication was known to occur only in Brazil.