M. wiesingeri Boed. in Kakteenkunde 204. 1933, with illustration.
Solitary, depressed globose, the type 4 cm. high, 8 cm. in diameter
with thick roots; tubercles slender-pyramidal about 10 mm. long, 3-4 mm. broad at the base, axils naked or with occasional bristles. Central spines 4 rarely 5-6, 5-6 mm. long, red-brown; radial spines about 20, 5-6 mm. long very thin acicular, glassy white. Flowers about 12 mm. long and 10 mm. in diameter, carmine red, the style pink with 5 short white stigmas. Fruit slender clavate, 1 cm. long, carmine red; seed yellow-brown, pyriform.
MEXICO: Hidalgo, near Metzquititlan, alt. 2000 m. amongst obsidian
rocks. Found by a Herr Wiesinger and transmitted to Boedeker via C.
Halbinger
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