Generic short diagnoses:
Smooth, cream to brownish, firm ascomycete truffles with a marbled, creamish gleba, sac-like asci and spiny, pale yellowish to pale brownish, ± globose spores.
www.MycoKey.com
With the MycoKey DVD you will find thousands of pictures along with detailed
generic descriptions, references and interactive, synoptical keys to the
genera.