Before christmas I obtained a couple of the the above plants. They were labeled has M.lasiacantha RS 571 (Roman Stanik). Location...Km163, Route 40, before Cerro Bola, Coah.
Over christmas I was reviewing Wolter ten Hoeve articles on ' M.lasiacantha and related taxa '. In part 3, which appears on page 196, AfM 32 (4) 2008 he makes the comment that M.lasiacantha lacks the ability to form a central spine, so this got me thinking what could this lasiacantha ilke plant be ?
I started working my way throught other journals and found, what I believe is the answer in the UK Mammillaria Society Journal, 45 (2) 2005, page17. In an article by the Fitz Maurices's on ' The tangled taxonomic web of M.stella de tacubaya and M.gasseriana' is a photograph of the same plant labaled M.gasseriana WAF 2289. I E-mailed the above photo the the Fitz Maurice's and they came back with a reply saying that they thought (without seeing a live plant) that their WAF 2289 was the same has this RS 571.
Does anyone else grow this and could offer futher comment, possilbly having a more mature plant which may have flowered and could post a picture.

Tam This one I have

Hi Mark,

I also have this RS 571, labelled as M. lasiacantha hooked spines. This plant was acquired from Wiebe Bosma,who had grown it from seed obtained from Jan Jecminek under the name JJO 4025F. After contacting Jan Jecminek, he wrote me that he had obtained these seeds from Roman Stanik. I was unsuccessful in contacting Roman Stanik.
For the moment I would label it as M. gasseriana, but I am not completely sure about this, it might turn out to be intermediate between M. gasseriana and M. magallanii.

Best wishes,

Wolter ten Hoeve, Assen, The Netherlands.