The genus Thelocactus 

Thelocactus rinconensis

Scanning electron microscope micrographs of Thelocactus rinconensis seeds. Seeds are medium-sized to large, with the longest axis of 1,9-2,3 mm and a diameter of 1,5-1,6 mm. The hilum-micropylar border is expanded around and constricted above the hilum. The micropyle lies outside the hilum or on its border. Anticlinal boundaries are raised and straight. Outer periclinal walls are tabular or slightly convex with a verrucose surface.

Thelocactus rinconensis Ramos Arispe, Coahuila (40x) Photo: A. Mosco		Thelocactus rinconensis Ramos Arispe, Coahuila (320x) Photo: A. Mosco
Thelocactus rinconensis Ramos Arispe, Coahuila (320x) Photo: A. Mosco		Thelocactus rinconensis Ramos Arispe, Coahuila The hilum-micropylar region with the micropyle set close to the hilum rim. (640x) Photo: A. Mosco