Mammillaria heyderi

Mammillaria heyderi is USA native. It is simple-looking plant, in nature growing flat with the ground. Early spring that in the wild happens as early as February is the flowering time.

Mammillaroa sanchez-mejoradae

5X close up of M.sanchez-mejoradae spines. The 'hairs' are about 10 micrometers  thick.

Eriosuce subgibbosa

Here is the new about a week old bud of Eriosyce. Magnification 2X - that is, the bud is less than 5 mm or 1/5 of inch in diameter.

Stenocactus albatus

This is a 2x close-up of Stenocactus albatus flower. 

Taking pictures at higher magnification becomes elaborate - the very shallow depth of field requires taking several shots, scanning the subject with the focal plane, and then reassembling them into a single image using post-processing software. This image is a superposition of 6 shots, needed to accommodate the stigma lobes depth.