Decades of North American Lichens.

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

196. Pyrenula cinerella, (Flt.) Willey.

*On bark of Zanthoxylum Americanum.*

Weeping Water, Nebraska, Nov. 29, 1895.

Coll. Thomas A. Williams.

Yale University Herbarium

YU.235996