種名未定のExobasidium屬菌に因る椿の罹病葉柄及び葉の病態組織に就きて

抄録

The writer reported already the results of his investigation on the histological changes of hypertrophied buds of the Camellia (Camellia japonica L.) caused by Exobasidium Camelliae SHIRAI. In the vicinity of Kyoto, the same plants are attacked very often by a different fungus belonging to the same genus, which is treated by HARA under the name of E. Camelliae SHIRAI var. nudo SHIRAI. The disease under consideration attacks the young leaves causing the circular spots as in the case of the blister blight of tea plant caused by E. vexans. The disease spreads sometimes to the petioles and also attacks the young green stems. The present paper deals with the results of the writer's investigation on the histological changes of deformed leaves, petioles and stems caused by this disease. Differing from the results of previous investigation on the hypertrophied buds, the deformation in the present disease seems to be occurred by hypertrophy of the cells only. Hyperplasia do not take place in all the affected parts and consequently the number of the layers of cells is not changed. The arrangement of the hypertrophied cells is regarded clearly as to be osmomorphosis. The hymenium of the causal fungus, having apparently exogenous appearance, develops at first under the epidermal cells or in the intercellular spaces of one to three subepidermal layers of cells. These overlying layers of cells rupture later, exposing the hymenium.