(rust fungi; subdivision Basidiomycotina)
A class of fungi that are obligate parasites (see parasitism) of a wide variety of plants including angiosperms, gymnosperms, and pteridophytes. Many have complex life cycles that involve the sequential formation of up to 5 different types of spore. Some rusts can complete their life cycle in a single host plant, while others require two different host species.
Subjects: Plant Sciences and Forestry.