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Abstract
The new species Isoëtes sabatina is described and illustrated. Morphological, anatomical, and ecological characters are given. It differs from the similar I. echinospora by several characters, such as megaspore ornamentation and size, microspore size, velum extension and form, and also for its ecology. A table showing the main differential characters of the new species compared with those of the other European aquatic species is presented. So far, the species is known from a single locality (Bracciano Lake, central Italy), having a peculiar ecology and within the Mediterranean bioclimate.
Acknowledgements
We thank the keepers of the herbaria FI, RO, and PAL for the loan of study material, Carmela Di Liberto (Dipartimento di Biologia ambientale e Biodiversità, Università di Palermo) for the assistance with scanning electron microscopy, and two anonymous reviewers for their valuable comments and suggestions. Financial support from International Foundation Pro Herbario Mediterraneo and Fondazione per la Flora Italiana is gratefully acknowledged.