Decades of North American Lichenens.

CLARA E. CUMMINGS, THOS. A WILLIAMS AND A. B. SEYMOUR.

253. Trypethelium virens, *Tuck.*
*On Fagus ferruginea.*

Plymouth, New Hampshire. Apr., 1897.

Coll. Clara E. Cummings.

Yale University Herbarium

YU.236087