The morphology of edge lines produced by chained immature conidia on conidiophores in powdery mildew fungi was studied, Twenty species of powdery mildew fungi from 98 host plant species were classified into 2 groups; one with sinuate edge and the other with crenate edge.Of the fungi examined, all species of Cystotheca and Erysiphe have Sinuate edges and all species of Arthrocladiella, Podosphaera, Sawadaia, and Sphaerotheca have crenate edges, The difference between the two types was clearly seen in herbarial as well as fresh material, Therefore, the edge line of catenate conidia was suggested as a taxonomic character for the differentiation of Cystotheca and Ery-Siphe from the other genera of powdery mildew fungi in the conidial States, It is of special significance to differentiate &. cichoracearum from S. fuliginea in dried herbarium materials having only conidial state, Shin, H-D and La, Y-J.1993."Morphology of edge lines of chained immature conidia on conidiophores in powdery mildew fungi and their taxonomic significance."
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Shin et al. (1993) studied this question.