Common names: Long-Tubercled Mammillaria / Finger Cactus / Nipple Cactus
The very elongated, soft-looking green tubercles are the strongest diagnostic feature. M. longimamma is accepted by Kew, and descriptions give long tubercles with pale radial spines and a longer central spine.
Water moderately and allow the soil to dry slightly between waterings. Place in bright, indirect sunlight for best results. Use well-draining potting mix and fertilize during growing season.
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