Astrophytum myriostigma
(Photo: Wen-Chung Fan)
fans@igc.org
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This is albino Astrophytum myriostigma.  It doesn't get as big as the usual form, and usually dies within two years. This one reached about 5 cm in diameter, and was about 6-7 cm tall. It was grafted on Echinopsis, but it passed away earlier this year. http://go2.163.com/cactusfan/whitemyriosm.jpg