Lepraria celata

This lichen forms a powdery grey-green to pale grey crust with edges that can be either diffuse or clearly defined. It lacks lobes and has no true inner layer (medulla). The base layer (hypothallus) consists of sparse patches of white threads (hyphae). The reproductive structures consist of abundant fine powder-like granules (soredia) typically measuring 35–50 (although sometimes as low as 20 or as much as 60) μm in diameter. Projecting threads are rarely present on these granules, and when present are short. The species contains atranorin (which can vary from major to minor quantities) and roccellic/angardianic acid. The results of standard chemical spot tests are K− or + (faint yellowish), C−, and Pd−.

Lepraria celata grows on soil and plant litter, and on mosses, often in rock crevices. It occurs in open habitats. The species was initially found in Europe (Bulgaria and Ukraine), and is thought to have a wider distribution. Other lichen species that have been found to associate with L. celata include Lecanora intricata, Lepraria eburnea, L. vouauxii, Umbilicaria deusta, and Umbilicaria cylindrica.

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