Mamillaria amber drops

Hi, I have been growing cactus from last year introdusing also some mamillarias. Just few days ago on one of my M. Orcuttii neppls I noticed some very small hard and yellowish drops, like amber (see my picture). I watered all mamillarias about 12 days ago and these drops are only in the side of full-light of the plant , just only one orcuttii.

Please does anyone could explain me something about this?

Thank you for your support

Some kinds of Mammillaria contain within their tissues a white latex that, in order not to make it too long, work as a cicatrizant in the presence of a lesion of the tissues themselves.
Probably the plant damaged in those points has produced some droplets of this latex which later on became oxidized.

M. orcuttii is a flat, globular plant and has radial spines when young. Your plant does not really look like M. orcuttii (see the older discussion on the forum about M. orcuttii, https://mammillaria.forumotion.net/t1776-mammillaria-orcuttii). What is the origin of your plant? Does it carry a field number or a seed list number? A photo of the top of the plant and of the flowers could give some more information.

Regards,

Wolter.

There is a nice article about M. orcuttii in the free online journal Xerophilia, see http://xerophilia.ro/wp-content/uploads/2018/02/xerophilia-2018.02-23.pdf

Wolter.

These are the two mamillarias "orcuttii" without field number coming from England nursery

The tops of the plants do show some 'orcuttii-behaviour', there is much wool and there are some dark centrals. In M. orcuttii these central spines should be very prominent, however. I still have doubts that your plants are orcuttiis, but yet, they could indeed be orcuttiis.
Also, comparing the sizes of all the plants in your photo, the orcuttiis are still quite small and that could explain why there are many radial spines (which young orcuttiis often have). We will have to wait until the plants are mature and produce flowers, then we can draw a better conclusion.
My 3 seed-grown orcuttiis (habitat seed) are still quite young. They are now 5 - 6 cm in diameter and have 2 - 4 very dark (almost black) central spines and no radial spines. On the old, bottom areoles, however, there are many very thin radial spines. The body colour is a darker green than your orcuttiis. All in all, my orcuttiis look very much like the orcuttiis on habitat photos.


Wolter.