Probably every one in the eastern United States who is interested in the fungi knows Hymenochaete agglutinans Ellis, at least by sight. The writer had been acquainted with it for many years before he knew its name, but, when its identity was once revealed, the aptness of its name made it unforgetable. During the month of July, I914, cases of disease directly due to the action of this fungus were observed, and the results of the investigation of these cases form the subject of the present paper. While carrying on some experimental work in the woods at Mt. Carmel, Connecticut, the writer's attention was atracted by a small bush or tree which appeared to have been suddenly killed. The leaves, although still a dark-green, were withered and dry, and hung downward, presenting a sharp contrast to the surrounding healthy foliage. Thus, from a little distance, the symptoms were those of a sudden girdling of the plant, as, for example, from the work of an insect, or possibly as a result of mechanical injury. (Plate 145, figure i.) On examination, the plant was found to be a large spice bush [Benzoin aestivale (L.) Nees], with several main stems. One of these, the diseased shoot in question, was firmly bound to a dead trunk of alder [Alnus incana (L.) Moench.], which lay in an approximately horizontal position. The binding material was furnished by the fungus, Hymenochaete agglutinans, which, with the dead alder trunk as its source, had completely surrounded the spice bush stem and cemented it closely to the alder. Above this point of contact, with the exception of one short branch, the spice bush was entirely dead. (Plate I45, figures I and 4.) Further inspection revealed a young red maple (Acer rubrum L.) attached to the same dead alder in a similar manner, and also killed above the