New or Interesting North American Lichens. I

Pannaria melamphylla is shown to be a member of the Lichinaceae and is placed provis?ionally in the genus Gonohymenia. Two lichens new to the North American flora are reported from the southeastern United States: Heppia tortuosa (Nees) Vain., previously known from Brazil, and Pleuro- theliopsis australiensis (Miill. Arg.) Zahlb?r., previously known from Australia. The new combination Gonohymenia melamphylla (Tuck.) Henss. is made. Gonohymenia mesopotamica J. Stein is reported as a synonym of Rechingeria cribellifera (Nyl.) Serv., and the genus Forssellia Zahlbr. as a synonym of Ptery- giopsis Vain. The relationship between the Lichinaceae and the Heppiaceae is discussed. Gonohymenia melamphylla (Tuck.) Henss., comb. nov. Pannaria melamphylla Tuck., Synop. No. Amer. Lich., 123, 1882 (holotype, FH; isotype, c; collected in 1866 by Frost in Vermont). Pannaria melamphylla was described by Tuckerman (1882) as sterile and he therefore regarded the inclusion of the species in the genus Pannaria as provisional only. A restudy of the original collection revealed that the holotype is in fact fertile