
doi: 10.1038/212318a0
THE formae speciales of the Ascomycete Erysiphe graminis cause powdery mildew of cereal crops, a disease of considerable economic importance. The chromosome number of the fungus is, however, not recorded in the literature. Chromosome counts following meiosis of a few related species and genera have been made1–6, and in general these suggest a haploid number of four (n = 4).
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