Does anyone know what kind of cactus this ugly thing might be? Unfortunately I don't have pics of it flowering, but I can tell you that it has beautiful yellow flowers with a dark red centre, ca. 3.5 - 4.0 cm high and 5.5 - 6.0 cm wide. I suspect it could be an Eriosyce of some kind, but It's really just a wild guess; I have just little knowledge about this genus.
http://community.webshots.com/user/edua ... us%201.jpg
N.B. Hope this link will work, I couldn't figure it out how to do.