Lepraria caesioalba is a widely distributed species of leprose lichen in the family Stereocaulaceae.

[2] The species was first described as Crocynia caesioalba by Maurice Bouly de Lesdain in 1914,[3] and was later transferred to Lepraria by Jack Laundon in 1992.

[4] The type specimen was collected in France and is housed at the Royal Botanic Garden Edinburgh (E), with additional topotype material at the Natural History Museum, London (BM), Geneva (GL), and Paris (PC).

The reproductive structures consist of abundant coarse or variably sized granules (soredia), typically measuring 100–150 (sometimes up to 200) μm in diameter, which sometimes have short projecting threads (hyphae).

The species has a wide distribution, having been recorded from Europe, North and South America, Asia, Australasia, Antarctica, and Greenland.