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Phytomyxea
The Phytomyxea are a class of protists that are parasites of plants. They are divided into the orders Plasmodiophorida (ICZN, or Plasmodiophoromycota, ICBN) and Phagomyxida. A more common name for them is the plasmodiophorids, but this does not always include ''Phagomyxa'' (see taxobox).
==Life cycle==
They typically develop within plant cells, causing the infected tissue to grow into a gall or scab. Important diseases caused by phytomyxeans include club root in cabbage and its relatives, and powdery scab in potatoes. These are caused by species of ''Plasmodiophora'' and ''Spongospora'', respectively.
The vegetative form is a multinucleate cell, called a plasmodium. This ultimately divides to form new spores, which are released when the host's cells burst. Both resting spores and motile zoospores, which generally have two smooth flagella, are produced at different stages. Within the plasmodium, dividing nuclei have a distinctive cross-like appearance.
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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