n. pl.1.(Zool.) A division of trematode worms having more two suckers. Called also Polystomea and Polystoma.
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Remarks: Cladonia polystomata Ahti & Sipman is probably the most similar species by its largely ecorticate podetial walls with scattered squamules and thamnolic acid chemistry, and differs by the conspicuous, wide open axils forming wide funnels and more persistent, larger podetial squamules.