oidium

oidium, in fungi (kingdom Fungi), a single-celled asexual spore (arthrospore) produced by fragmentation of fungal filaments (hyphae) in lower fungi; the asexual stage of Erysiphaceae (powdery mildew fungi); or, in Basidiomycota, both an asexual spore (microconidium) and a male cell (spermatium).

This article was most recently revised and updated by Kara Rogers.

Citation Information

Article Title: oidium

Website Name: Encyclopaedia Britannica

Publisher: Encyclopaedia Britannica, Inc.

Date Published: 22 January 2008

URL: https://www.britannica.comhttps://www.britannica.com/science/oidium

Access Date: February 06, 2025