Ariocarpus trigonus
(now = Ariocarpus retusus)
Growing with an Astrophytum asterias population in Tamaulipas, Mexico.
We would call this a retusus but as the two species have been merged its probably a moot point.
Specimen in private collection in Tamaulipas, Mexico.
Image below was taken from our photo archives.
Other Ariocarpus species that were encountered in the field:
Ariocarpus fissuratus
Ariocarpus kotschoubeyanus
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