Soltanto queste referenza dal Journal e nessuna documentazione fotografica.....

M. crocidata Lemaire, Cact. Aliq. Nov. Hort. Monv. 9. 1838.
Subglobose, depressed; axils densely woolly. Spines 2 (in one variety 3, very rarely 4) the upper 8mm. long, the lower 12-l6mm., pinkish
white, tipped dark purple,
Mexico: Brought to Europe by Deschamps.
Nor surprisingly, in view of the incomplete description, this species
has been variously interpreted. It may have been one of the phases of species complex which includes M.kewensis, M.hidalgensis, M.tetracantha etc., but its identity is inevitably dubious.

M.crocidata appears to be something very close
to M.durispina.


In realtà qualche fotografia in rete c'è, ma totalmente inattendibile.
Viene mostrato qualcosa vicino a M. heyderi che non vale la pena di riportare.