The Monoblastiaceae are a family of lichen-forming fungi in the monotypic order Monoblastiales. It contains six genera. These lichens typically form inconspicuous thin crusts or films on bark, rock, or leaves, often appearing as little more than a whitish or greyish discolouration of the surface. They reproduce through tiny black flask-shaped structures embedded in the crust that release spores through small pores at their tips. The family includes about 120 species distributed worldwide, particularly in tropical and subtropical regions where they grow in humid environments.

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