, Volume 35, Issue 2, pp 141–145 | Cite as

Ascospore formation and morphology in two species of the genusErysiphe remaining immature on the living host plant

  • Seinosuke Tanda
Original Papers


Erysiphe cumminsiana andE. galeopsidis, which have immature asci in the current season, have been recorded from Japan, but the ascospores of both fungi have not been described. In the present experiments, some observations before and after overwintering were made on the cleistothecia ofE. cumminsiana on three species ofCacalia and two species ofLigularia, andE. galeopsidis onGeranium thunbergii. After overwintering, the former fungus developed six to eight, rarely four spores in an ascus and the latter fungus always four spores in an ascus. Their teleomorphic characteristics including those of ascospores are also described.

Key Words

ascospore development Cacalia Erysiphe cumminsiana Erysiphe galeopsidis Geranium thunbergii 


Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

Literature cited

  1. Amano, K. (=Hirata, K.) 1986. “Host range and geographical distribution of the powdery mildew fungi,” Jpn. Sci. Soc. Press, Tokyo, 741 p.Google Scholar
  2. Braun, U. 1983. Descriptions of new species and combinations inMicrosphaera andErysiphe. Mycotaxon18: 113–129.Google Scholar
  3. Braun, U. 1987. A monograph of the Erysiphales (powdery mildews). Nov. Hedw.89: 1–700.Google Scholar
  4. Hirata, K. 1956. Additional list of the host plants of powdery mildews in central Japan. Ann. Phytopath. Soc. Japan21: 88–91 (in Japanese).Google Scholar
  5. Hirata, K., Nakayama, K. and Asami, M. 1964. A list of powdery mildews and their host plants collected in Kiso area, Nagano Prefecture, in September of 1963. Niigata Agric. Sci.16: 91–93 (in Japanese).Google Scholar
  6. Homma, Y. 1937. Erysiphaceae of Japan. J. Fac. Agric. Hokkaido Imp. Univ.38: 183–461.Google Scholar
  7. Nomura, Y. 1974. An additional list of host plants of Erysiphaceae in the central Japan. Trans. Mycol. Soc. Japan15: 72–74 (in Japanese).Google Scholar
  8. Otani, Y. 1988. Ascomycotina No. 2 Onygenales·Eurotiales·Ascosphaerales·Microascales·Ophiostomatales·Elaphomycetales·Erysiphales. Seiya Ito's Mycological flora of Japan3: 157–269 (in Japanese).Google Scholar
  9. Salmon, E. S. 1905. The Erysiphaceae of Japan, II. Ann. Mycol.3: 241–256.Google Scholar
  10. Takamatsu, S., Ishizaki, H., and Ito, O. 1978. The powdery mildew fungi and their host plants in Mie Prefecture. Trans. Mycol. Soc. Japan19: 65–77 (in Japanese).Google Scholar

Copyright information

© The Mycological Society of Japan 1994

Authors and Affiliations

  • Seinosuke Tanda
    • 1
  1. 1.Faculty of AgricultureTokyo University of AgricultureTokyoJapan

Personalised recommendations