Mammillaria ritteriana

Mammillaria ritteriana
Hunt refers this species to M.chionocephala; it is a distinctive variant with finer and longer spination












Mammillaria ritteriana Z 40
Z 40 - Ramos Arizpe - Coahuila - Mexico
Referred to Mammillaria chionocephala











Mammillaria ritteriana Z 40
Z 40 - Ramos Arizpe - Coahuila - Mexico
Referred to Mammillaria chionocephala





Mammillaria ritteriana SB 265
SB 265 - Ramon Arispe - Coahuila - Mexico
Referred to Mammillaria chionocephala










Mammillaria ritteriana ROG 192
ROG 192 - Huigueras - Nuevo Leon - Mexico
from UK Mammillaria reference collection
Referred to Mammillaria chionocephala