Acarospora strigata

Acarospora strigata is an areolate to verruculous crustose lichen that grows on rock around the world, in full sun or shade, and in mesic to arid habitats.^{[2]: 220 [3]} It is brown but may appear white or pale gray if it is covered in a pruina.^[2]: 220 The lichen is common in southwestern deserts of North America.^[3]

Areoles (from tiny to 3 mm) surrounding dark reddish-brown to black apothecia (fruiting bodies) are both highly variable in shape and size, and variable in size relative to each other.^{[2]: 220 [3]} Measuring 0.1–1 mm, the apothecia range in size from small dots on the areoles to almost as wide as the areole.^{[2]: 220 [4]} They can be pointlike to round, polygonal to stellate radiating fissures, and one to many per areole.^[3]

Areoles may be cracked on the surface, especially toward the apothecia.^[2]: 220

Lichen spot tests are all negative.^{[2]: 220 [3]}