Table 1: Characters used to compare and describe individuals.

Morphometric characteristics Isoëtes iapygia Isoëtes todaroana Corm lobes Trilobed Rounded Corm width (cm) 0.8 0.5 Shape of corm section Hexagonal Irregular Root shape Dichotomous Dichotomous Leaf shape Filiform, arched Lanceolate, erect Leaf number 20 25 Velum Complete Complete Stomata Present Present Number of air chambers 2 2 Scales Present Absent Phyllopodia Absent Present Macrospore macroornamentation Tuberculate Tuberculate Microspore macroornamentation Coniculate-echinate Aculeate Macrospore microornamentation Densely fimbriate Filamentous Macrospore diameter (μm) 450 440 Macrospore profile Rounded Triangular Microspore lenght (μm) 30 25 Ligule shape Ovate Lanceolate Ligule lenght (mm) 1.2 1.0 Laesura arms Flattened Raised Equatorial ring Little pronounced Pronounced Ecological characters      Habitus Terrestrial Amphibious  pH of soil 7.3 8.7  Type of soil clay clay  Geological substrate Limestone Sandstone Habitat      Type (Natura 2000 Code) 3170* 3170*  Characteristic species of community Pleurochaete squarrosa (Brid.) Lindb., Cheilotela chloropus (Brid.) Broth., Ranunculus sardous Crantz, Polypogon maritimus Willd., Romulea bulbocodium (L.) Sebast. et Mauri, Romulea columnae Sebast. et Mauri. Bolboschoenus maritimus (L.) Palla, Eleocharis palustris (L.) Roem. and Schult., Scirpus cernuus Vahl, Mentha  pulegium L., Oenanthe sp., Lythrum sp., Tamarix sp., Romulea sp., Geographical range      Sites of presence 10 1  Chorology Southern Puglia Insufficient data