Bagliettoa is a genus of lichen-forming fungi in the family Verrucariaceae. Bagliettoa species are endolithic, growing between the grains of solid rock. These lichens are almost invisible to the naked eye, living mostly hidden within limestone and other calcium-rich rocks with only a thin polished rim visible on the surface. They reproduce through tiny flask-shaped fruiting bodies that bore neat pits into the rock as they develop.

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