What is "didonia"

Didonia \Di*do"ni*a\, n. [NL. So called in allusion to the classical story of Dido and the bull's hide.] (Geom.) The curve which on a given surface and with a given perimeter contains the greatest area.
--Tait.

Didonia is a genus of fungi within the Hyaloscyphaceae family. The genus contains 5 species.