Wel, this didnlt get any level of interest, so I'm now posting my list of what I have available to swap. I'm only really looking for seedlings with field collection numbers. Don;t worry about what you call the plant, so long as there is habitat data.
Mine are:
Mammillaria albilanata ssp oaxacana 'juxtlahuacensis' TL205 **
Mammillaria canelensis ROG649
Mammillaria canelensis ROG651
Mammillaria cobrensis ROG642
Mammillaria craigii ROG637
Mammillaria crassimammilis L1069 **
Mammillaria droegeana RIVAS **
Mammillaria glochidiata ssp xiloensis ML045 **
Mammillaria hahniana sps mendeliana ML234 **
Mammillaria heyderi ssp heyderi ML120 **
Mammillaria karwinskiana 'confusa' ML384 **
Mammillaria lasiacantha ML538 **
Mammillaria lasiacantha egregia SB30 **
Mammillaria lasiacantha ssp magallani SB143
Mammillaria maycobensis ROG222
Mammillaria prolifera (Vilardebo, Cuba)
Mammillaria schiedeana ML149 **
Mammillaria sinforosensis ROG641
Mammillaria temorisensis ROG645
Mammillaria temorisensis ROG653
Mammillaria tepexicensis FO-177 **
Mammillaria voburnensis 'queztalcoatlii' ML374 **
Mammillaria yaquensis
Mammillaria yoloxis ML359 **
Those marked ** are in very short supply, often just 1 left.
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Chris43, moderator