Found at high altitudes in the Venezuelan Andes, it is characterised by its unique isidia-covered thallus and specific ascospore morphology.

The type specimen was collected in Libertador, Pico Espejo, Mérida, Venezuela, on tree bark in a mountain forest at an elevation of 4,200 m (13,800 ft).

[2] The thallus of Rinodina maronisidiata originates as ochraceous to brown corticated granules, soon covered by a thick layer of isidia and subsequently coalescing.

They are ochraceous to brown, often mottled, dull to partly glossy, and measure approximately 50–80 μm thick and up to 0.4 mm long.

[2] Rinodina maronisidiata is found on tree bark in mountain forests and at the time of its initial publication was known only to occur in Venezuela.