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Erysiphales
Erysiphales are an order of ascomycete fungi. The order contains one family, Erysiphaceae. Many of them cause plant diseases called powdery mildew.
== Systematics ==
The order contains one family (Erysiphaceae), 28 genera and approximately 100 species. Many imperfect fungi (fungi whose sexual reproduction is unknown) belong here, especially the genus ''Oidium''.
Recent molecular data have revealed the existence of six main evolutionary lineages. Clade 1 consists of ''Erysiphe'', ''Microsphaera'', and ''Uncinula'', all of which have an ''Oidium'' subgenus ''Pseudoidium'' mitosporic state. Clade 2 consists of ''Erysiphe galeopsidis'' and ''Erysiphe cumminsiana'' (anamorphs in ''Oidium'' subgenus ''Striatoidium''). Clade 3 consists of ''Erysiphe'' species with anamorphs in ''Oidium'' subgenus ''Reticuloidium''. Clade 4 consists of ''Leveillula'' and ''Phyllactinia'', which have ''Oidiopsis'' and ''Ovulariopsis'' mitosporic states, respectively. Clade 5 consists of ''Sphaerotheca'', ''Podosphaera'', and ''Cystotheca'', which have ''Oidium'' subgenera ''Fibroidium'' and ''Setoidium'' mitosporic states. Clade 6 consists of ''Blumeria graminis'', which has an ''Oidium'' subgenus ''Oidium'' mitosporic state. Several morphological characters have been analysed and found not to conflict with the molecular data.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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