Zwackhia viridis is characterised by a subtle and svelte thallus that can range from being barely noticeable to a fine texture.

Its colour spectrum includes shades of pale brown, grey, greenish-grey, brownish-grey, and green, all in a matte finish.

[4] Underneath the hymenium, the excipulum is of a dark brown shade which turns an olivaceous colour upon a potassium hydroxide (K) chemical spot test.

These spores, in their mature state, have median cells roughly equal in length and breadth, with the end locules being more stretched.

The perispore around the spores is 1.5–2.5 μm wide and clear, but it transitions to an even brown hue when it matures beyond its prime.

[4] Zwackhia viridis has a cosmopolitan distribution, having been documented in Africa, Asia, the Americas, Europe, and Oceania.