LICHENES BOREALI-AMERICANI.

Second edition of Decades of N. Am. Lichens.

PREPARED BY

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

128. Pyrenula cinerella, (Flt.) Willey.

On bark of Zanthoxylum Americanum.

Weeping Water, Nebraska, Nov. 29, 1895.

Coll. Thomas A. Williams.

=N. A. L 196.

Yale University Herbarium

YU.235995