The first place of visit was in the surrounding of El Herrero, South-West from Matehuala. The short chewed grass showed the effect of grazing. The soil and the parent material seemed to be adequate for Ariocarpus but no specimens were found. Nevertheless on a hilltop, in a shad of a bush there was growing an Ariocarpus bravoanus subsp. hintonii. The grey colour and the tubercles on its mammas hide it completely among the stones. A young local shepherd told that some kind of rodent eats the roots of the Ariocarpus plants here. Thus some plants were seen to be dag out and died. The second place was a territory around Huizache, 80 km from Matehuala. Away from the road, beyond a barbed wire fence, the lands seemed to be good for Ariocarpus kotschubeyanus, but no plants were found, most probably as a result of pasturage and treading. On the hill foots, there were Lophophora williamsii and Echinocereus pentalophus specimens growing in the shade of bushes. No Ariocarous retusus were found, however. On the other side of the road, the lands were more flat and loamy, with some gullies. There were numerous Echinocereus pectinatus plants growing with some Lophophora williamsii in the shade of bushes. On the side of the sagebrush vegetation, there were some Ariocarpus kotschubeyanus plants found, retracted into the loamy soil, spread on the lawns between the sagebrush bushes. The third place was in the direction of the city of San Luis Potosí, were Ariocarpus bravoanus lives according to the descriptions. Nevertheless some information indicated that the habitat has been spoiled already. Close to El Nuñez, the land bordered by barbed wire fence was sloppy and fragmented by gullies. It was easy to find Ariocarpus bravoanus specimens, most of which were young plants but some reached the size of being able to flower. Nevertheless a single adult plant was found only. The signs around the plants indicated that the population is under a scientifical investigation. The fourth place to visit was a Pelecyphora aselliformis population South-East from Charco Blanco. Plants on the habitat, growing on tle lawns hide themselves completely. They were retracted into the dry soil that, together with their whitish-greyish colour gave them a perfect camouflage. According to the descriptions, there are several Pelecyphora aselliformis populations around the city of San Luis Potosí. On a next habitat, the lands were disturbed, but even with the land works there were found some nice and undamaged Pelecyphora speciemens.
