Puttea duplex

Puttea duplex is a species of lichen of uncertain familial placement in the order Lecanorales. This tiny, inconspicuous lichen forms pale greyish films over decaying moss on tree bark and produces extremely small, yellowish-brown disc-shaped fruiting bodies that are barely visible to the naked eye. It is distinguished from similar species by having an unusually large number of ascospores (16–24) packed into each spore sac, compared to the typical eight found in related lichens.