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Abstract
Isoëtes iapygia from the Apulia region (southern Italy) is described as a new species and illustrated. It differs in several characters from the other Mediterranean Isoëtes species, but has some intermediate characteristics similar to terrestrial and amphibious Isoëtes. I. iapygia is similar to the amphibious species for the lack of phyllopodia, even if it has scales; it is similar to terrestrial species for the complete velum and tuberculate macrospores. A completely unique character is represented by the two air chambers. Its habitat is on limestone rocks, in temporary pools.
Acknowledgements
The authors profusely thank Michele Aleffi, Simonetta Bagella, Maria Carmela Caria, Giuseppe D'Alessandro, Marcella D'Elia, Daniela Gigante, Giorgio Mancinelli, Silvano Marchiori, Piero Medagli, Luigi Palmisano, and Angelo Troia for their cooperation. They especially thank Enrico Banfi for the revision of the diagnosis, and Dino Marchetti who, with his suggestions and comments, has contributed to the outcome of this research.
