Freely clustering, body elongate, up to 13 cm high, 1-2(-4.5) cm wide, without milky sap. Tubercles prominent. Axils slightly woolly. Central spines 3-5, to 10 mm long, brownish. Radial spines 12-14, 3-8 mm long, white. Flowers white to about 1.2 cm wide. Fruit red. [M. fragilis Salm.-Dyck.]

EC Mexico

Sometimes sold under the name Frosty.

Source: Thompson, A, ; Forbes, S.; Spencer, R. (1997). Cactaceae. In: Spencer, R.. Horticultural Flora of South-eastern Australia. Volume 2. Flowering plants. Dicotyledons. Part 1. The identification of garden and cultivated plants. University of New South Wales Press.