The Isoetes longissima complex (Isoetaceae) in Italy: observations on the morphology of spores and leaves, and taxonomic implications

摘要: The morphological variability of the Isoetes longissima complex in Italy has been analyzed, on basis selected herbarium specimens. Observations were made spore ornamentation and size, number leaves per plant maximum leaf length, velum extension alae width basal portion leaves. first count chromosome plants from is also made. On our observations, five taxa here considered are attributed to two taxa, treated at species level as follows: I. (incl. velata [unranked] sicula ), tiguliana dubia ). Italian distribution these given.