Mammillaria...........?

Do you know the name of this Mammillaria?
Thank's
Marco

What we have is a straight spined member of the Ancistracanthae of which there are very few. I could only come up with two which can be found in habitat.... M.dioica and M.grahamii oliviae. I would choose the later.

ho riesumato questo vecchio post e ho trovato questa pianta simile alla mammillaria tipo boolii a spine dritte in vendita qui....

http://www.ilsoleraritabotaniche.com/

prova a dare un'occhiata se ti interessa ancora una identità per la tua pianta




il post intero lo puoi trovare qui...

https://mammillaria.forumotion.net/starting-with-b-f23/mammillaria-boolii-t1014.htm

translation.......
this plant is similar to mammillaria tipo boolii that i've found at "il sole rarità botaniche".

M. mazatlanensis !?

the place from wich my plant comes - baja san carlos - is typical for mammillaria boolii.
i don't know if mazatlanensis is present in baja san carlos.

The Marco plant could be a m. sheldonii fa. inaiae.
In Bahia San Carlos also grows m. inaiae, which has straight central spines

I am certain that the plant shown by Maurillio is not M. boolii. This has hooked spines and there is no known form of this plant with straight spines. M. sheldonii f. iniae is, as Ento says, found at Bahia San Carlos. Here is one that I saw in April this year.



But in a rather different part of Sonora, I also found some straight spined plants that were not really the same, though I believe them also to be a form of M. sheldonii.



It was a shame that there were no flowers.

Marco's photo is one of these M. sheldonii forms, I think. I have a plant which comes from Bacum, under the field number HK277 which has pale flowers, not unlike Marco's, but my plant has hooked spines. I think this just shows how variable this species is, and how it changes with the different habitats.