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conform with a definite term, and the beginner must be governed accordingly. While the writer is particularly indebted to Saccardo's "Sylloge Fungorum," he is also indebted to Thaxter's "Monograph of the Laboulbeniaceae," and his "Preliminary Diagnoses of New Species of Laboulbeniaceae,'' II-VI, for the material for the key to this group. The treatment of the Pezizales is largely that of Rehm's "Discomyceten," modified by the inclusion of the lichens. From Engler and Prantl's "Pflanzenfamilien," material has been drawn in the monographs of the bacteria by Migula, of phycomycetes and other groups by Schroter and Lindau, and especially of the lichens by Zahlbruckner. The writer is also under heavy obligation to Dr. Edith Clements, for the preparation of the Glossary, and for much other work of preparation and of publication. His thanks are also due to Professor Raymond J. Pool for assistance in the original mimeograph copies.