[1] It has been found in variety of locations in the southern region of Costa Rica, primarily in humid, shaded microsites within low-mountain rainforest environments.

[2] Coenogonium kalbii features a crustose thallus that is corticolous, continuous, thin and smooth, with a yellowish-green colouration, and ranges in diameter from 10–30 mm (0.4–1.2 in).

The photobiont of the species is the green algal genus Trentepohlia, with cells that are angular to rounded, and grouped in irregular plates or short threads.

Coenogonium kalbii is most closely similar to C. subfallaciosum but is distinguished by the smaller conidia and its apothecia frequently found marginally hypophyllous on a mycelium free of algae.

[2] This lichen species is primarily found in the southern regions of Costa Rica, preferring humid, shaded microsites within low-mountain rainforest environments.