Turbinicarpus
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Turbinicarpus klinkerianus
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turbinicarpus_klinkerianus
Larger picture 
2.5cm diameter seedlings, ex plug tray

Turbinicarpus lauii
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Approx 1cm seedlings

Turbinicarpus saueri nelissae
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(Formerly Gymnocactus ysabelae) ex 7cm pot

Turbinicarpus swobodae
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Very small, 1cm seedlings