The status of the name is uncertain.

Hypoxylon xanthostroma (Schwein.) Sacc., Syll. Fung. I, p. 392. 1882.

º Sphaeria xanthostroma Schwein., Trans. Amer. Philos. Soc., n. ser., 4: 193. 1832.

U.S.A.: Pennsylvania, Bethlehem, Syn. 1212, decorticated wood of Quercus (PH, HOLOTYPE; BPI; BPI-CLS, ISOTYPES of Sphaeria xanthostroma).

Sphaeria xanthostroma Schwein., from Pennsylvania, is represented by two scanty specimens of Schweinitz at PH and BPI in which no ascospores were found. However, it does have orange-red granules in stromata. Shear made a microscope slide from the Schweinitz type. It contains typical ascospores of Hypoxylon. Hypoxylon xanthostroma may be a young H. crocopeplum Berk. & M. A. Curtis. According to Fries (1832), there is probably an earlier homonym, Sphaeria xanthostroma Schmidt, which may represent a lichen taxon.


Jack D. Rogers
Yu-Ming Ju
Michael J. Adams