Heterogeneratae
plural noun
Het·ero·gen·er·a·tae
ˌhetə(ˌ)rōˌjenəˈrät(ˌ)ē,
-ˈrāt(ˌ)ē
: a class of brown algae including those having two alternating generations unlike in vegetative structure, the larger sporophyte being often macroscopic and the smaller gametophyte usually microscopic compare isogeneratae
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Merriam-Webster unabridged
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