Chlorovibrissea albofusca G.W. Beatson
These are small brown fruiting bodies up to 4–5 mm wide, on creamy white stipes. They are usually found in groups on rotting wood.
Chlorovibrissea phialophora Samuels & L.M. Kohn
This is a tiny fungus - these fruiting bodies are only 2–3 mm diameter.

