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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.[1]: 220 [2] It is brown but may appear white or pale gray if it is covered in a pruina.[1]: 220 The lichen is common in southwestern deserts of North America.[2] 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.[1]: 220 [2] Measuring 0.1–1 mm, the apothecia range in size from small dots on the areoles to almost as wide as the areole.[1]: 220 [3] They can be pointlike to round, polygonal to stellate radiating fissures, and one to many per areole.[2] Areoles may be cracked on the surface, especially toward the apothecia.[1]: 220 Lichen spot tests are all negative.[1]: 220 [2] References
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