Description

Mammillaria bertholdii f. superspina

Mammillaria bertholdii is a small remarkable cactus species found in nature in the Mexican state of Oaxaca by Andreas Berthold in 2013 and formally described by Thomas Linzen in 2014. It is believed to be a new member of the Group of Mammillaria. It is a very flat geophyte that produce only a small disc of tubercles that can be seen flat at the soil surface, however these plants grow a large tap root below the surface of the compost. The tubercles and areoles closely resemble a Pelecyphora aselliformis, or even Mammillaria pectinifera. On the other hand, the floral tube itself, fruit and seeds clearly shows its affinity with the Group saboae.

The “superspina” form adds even more intrigue, producing a striking arrangement that makes it look unlike any typical Mammillaria. The feathery spines are a perfect adaptation to extreme environmental conditions.

Instead of spines, this cactus often develops delicate white or yellowish woolly areoles, giving it a soft, almost textured look. In the right conditions, it produces beautiful magenta-pink flowers that create a striking contrast against its bluish-green body. Its compact growth habit makes it ideal for pots, rock gardens, and display collections.

This variety is slow-growing but well worth the patience. Like most Mammillarias, it thrives in bright light, well-draining soil, and minimal watering, making it an excellent choice for experienced cactus enthusiasts seeking a true rarity.

Mammillaria bertholdii (including the f. superspina form) is cryptocarpic.

That means the fruits remain hidden inside the body of the cactus rather than emerging above the surface like in most Mammillaria. The seeds develop within the plant’s tissue, and they’re only released when the fruit eventually decays or the plant naturally opens small fissures.

This is one of the reasons M. bertholdii is considered unusual and more challenging to propagate compared to other Mammillarias.