Mexican fencepost

Tucson, AZ

Does anybody know what is this white stuff at the base? It can be scraped off with one's thumbnail.
BTW, the cactus is not being irrigated.

Thumbnail by Marielouise2
Marquette, MI(Zone 5a)

You may want to post on the cacti and succulent forum.

That is a nicely appropriate name LOL.

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