. F"lG. 95.—Gymttoiporangium clavariacforme. I, teleutospore stage on juniper branch; 2, teleutospores; 3, teleutospores ger- minating and producing secondary spores, (7, a ; 4, aecidium stage on pear leaf ; 5, aecidium stage on branch, leaves, and fruit of hawthorn ; 6, aecidiospore germinating. Kigs. i, 4, and 5 reduced, remainder highly mag. Hawthorn cluster-cups (Gymnosporangium clavariaeforme, Jacq.) causes spindle-shaped swellings on the branches of [ttniperus communis, and during the months of April and May numerous flattened, pale-orange, gelatinous masses I

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Keywords: ., bookpublishernewyorkmacmillan, booksubjectplantdis, bookyear1910