Abstract
SUMMARY Cryptomycina Pteridis (Rebentisch ex Fries) von Höhnel, cause of leaf-roll of bracken, was studied in its relationship to Pteridium latiusculum (Desv.) Hieron ex R. E. Fries, the eastern bracken. Specimens of material used in the above experiments and observations have been deposited in the Herbarium of the Department of Plant Pathology of Cornell University, the Farlow Herbarium of Harvard University and the Herbarium of the Bureau of Plant Industry.

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