TYPE. "Ad truncum arboris in summo monte Doi Sutep, circ. 1675 m s. m." C.C. Hosseus s.n. (= Vainio Herb. no. 02999) (TUR-V).
Description. Lichenized fungus.
Thallus foliose, adnate to appressed. Lobes 1-3 mm wide, dichotomously branched, tips blunt and squarish, axils rounded. Upper surface pale greenish gray, smooth, shiny; vegetative diaspores coarse soredia or schizidia erupting from irregular pustules. Medulla white; photobiont chlorococcoid alga. Lower surface black; rhizines black, forked, abundant, forming a mat under and around lobes. Ascomata lecanorine apothecia with brown disks, rare.