Chromosome numbers for Isoëtes in northeastern North America

Abstract
Based on spore characteristics, five species and one distinct form of Isoëtes occur in northeastern North America. Two of the taxa, I. echinospora Dur. And I. eatonii Dodge, are diploids with a chromosome count of 2n = 22; three, I. riparia Engelm., I. tuckermanii A. Br., and I. macrospora f. hieroglyphica (Eat.) Pfeiffer, are tetraploids (2n = 44); and one, I. macrospora Dur., is decaploid (2n = 110).

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