Document Type



A foliage disease of Gleditsia triacanthos L., caused by a fungus that has been given a variety of names, is of wide distribution in the United States, occurring from the Atlantic seaboard to Nebraska and Texas ( 1) and will be found to occur wherever its host does. The conidial stage of the fungus has been long known as Melasmia hypophylla (B. & R.) Sacc. and appears to be restricted to the one host Gleditsia triancanthos L. The fungus was first noted in the vicinity of Iowa City about 1940, and appears to be becoming more common. The imperfect stage was formerly classified in the family Leptostromataceae of the Fungi Imperfecti and was first described by Leveille in 1845 as Sacidium Gleditschiae. In 1855 Berkley and Ravenel called it Leptostroma hypophyllum, but they provided no description. In 1888 specimens of the fungus were sent from Missouri, Louisiana and Kansas to Ellis and Everhart, who named it Melasmia Gleditschiae. In 1892 Saccardo concluded that Melasmia Gleditschiae and Leptostroma hypophyllum referred to the same species but did not recognize Sacidium Gleditschiae as a synonym. Saccardo used the binomial Melasimia hypophylla (Berk. & Rav.) Sacc. as the name of the tar spot so prevalent on the honey locust.

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Proceedings of the Iowa Academy of Science





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©1947 Iowa Academy of Science, Inc.



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