HYPOXYLON DURISSIMUM FR.The status of the name is uncertain.
Hypoxylon durissimum Fr., Summa Veg. Scand. II, p. 384. 1849; non (Schwein.: Fr.) Sacc., 1882; [nom. rejic., ICBN Art. 13.1 (d)].
º Daldinia durissima (Fr.) Sacc., Syll. Fung. I, p. 394. 1882.
º Sphaeria concentrica Wahlenberg, Fl. Lapp., p. 517. 1812; non Bolton [: Fr.], 1789; [nom. rejic., ICBN Arts. 13.1 (d) & 64.1].
We were unable to locate the type. Hypoxylon durissimum Fr. was erected to substitute for Sphaeria concentrica Wahlenberg which is a later homonym of S. concentrica Bolton: Fr. Cooke (1883b) considered Fries' H. durissimum to be a synonym of H. marginatum (Schwein.) Berk. Child (1932) suspected it a synonym of Daldinia concentrica (Bolton: Fr.) Ces. & De Not.