Mammillaria vonwissyana
Hunt has left this taxon in limbo, since it is not clearly identifiable with any wild population.
it persists in cultivation, and is a handsome white spined plant.
Mammillaria - John Pilbeam pag.340
On this forum....
https://mammillaria.forumotion.net/t1397-mammillaria-vonwyssiana?highlight=vonwyssianaMammillaria vonwyssiana
From "Giuse" Giuseppe Ruini collection - Rubiera
Mammillaria vonwyssiana
From "Ento" Ennio Toso collection - Savona
Seeds from Kores
Mammillaria vonwyssiana
From Antonio Gandolfo collection - Vicenza