Gyalectidium minus

About

Gyalectidium minus is a species of lichen-forming fungus in the family Gomphillaceae. It forms tiny silvery to whitish-grey patches on living leaves, with each patch broken into crystal-encrusted blister-like segments, and it reproduces asexually using small marginal structures that release propagules. Apothecia may also develop and can appear crater-like; each ascus produces a single colourless, multi-chambered ascospore. The species was described from the Canary Islands and is also known from southern Italy and from the humid Atlantic-influenced woodlands of the Sintra Mountains in Portugal.

Summary from Wikipedia