Abstract
the stress placed on the markings of the gynospores by Miss Pfeiffer in her monograph of the Isoetaceae2 has resulted in a rather distorted presentation of the relationships of the species is the conclusion reached by the author after a study of a wider range of morphological characters, of the ecological habits, and of the geographical distribution. Three species of this relationship are here recognized, all of which are distinct from the European I. echinospora Dur., with which they have frequently been united. The writer is indebted to C. A. Weatherby, C. V. Morton, and Joseph Ewan for suggestions.
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