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Diplotomma alboatrum

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description Diplotomma alboatrum Overview

Diplotomma alboatrum is a crustose lichen with a chalky white, pale gray, ochre, or pale brown thallus that is often cracked or areolate. Its small black apothecia may be covered with a whitish powder and are frequently abundant on the thallus. The species grows on calcareous and siliceous rock, bark, and dead wood, including exposed surfaces near the coast and at high elevations, and has been recorded across several continents.

help Diplotomma alboatrum FAQ

What does Diplotomma alboatrum look like on stone?

It forms a pale gray to whitish crust that may be smooth, cracked, or granular. Its black apothecia are usually about 0.2-1.3 mm across and often have a whitish powdery coating. ([lichen database](https://italic.units.it/index.php?num=908&procedure=taxonpage))

Where does Diplotomma alboatrum usually grow?

It is commonly found on calcareous rock, mortar, brick, and other base-rich surfaces, especially in sunny exposed places. It can also occur on bark, but field records often describe it as a calcicolous rock lichen. ([Association Française de Lichénologie](https://www.afl-lichenologie.fr/Photos_AFL/Photos_AFL_D/Diplotomma_alboatrum_sax.htm))

How can I distinguish Diplotomma alboatrum from Diplotomma chlorophaeum?

Diplotomma alboatrum generally has negative K, C, KC, and P spot tests, while D. chlorophaeum is noted for K-positive red and P-positive orange reactions. A microscope examination of the spores is still safer than relying on color alone. ([Association Française de Lichénologie](https://www.afl-lichenologie.fr/Photos_AFL/Photos_AFL_D/Diplotomma_alboatrum_sax.htm))

What algae and chemistry are associated with Diplotomma alboatrum?

Its photobiont is a chlorococcoid green alga, and the species is reported to contain no detectable lichen substances. The mature spores become brown and submuriform, meaning they develop several internal partitions. ([lichen database](https://italic.units.it/index.php?num=908&procedure=taxonpage))

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