Herbario Virtual del Mediterráneo Occidental
Àrea de Botànica, Departament de Biologia, Universitat de les Illes Balears
Isoetes duriei Bory
Family : ISOETACEAE
Genus : Isoetes
Province distribution : Balearic Islands. Barcelona. Gerona.
Distribution in the islands : Minorca.
General distribution : Mediterranean
Flowering time : February. March. April. May.
Life-forms : Geophyte.
Habitat : Wet silicicolous fields.
IUCN Category : Poco preocupante
Characteristics : Isoetes duriei is a small plant made up of rosette of linear leaves along the ground; the leaves are rigid and slightly curved spirally. The leaves are found on a very short stem that remains underground. The sporangii can be found at the base of the leaves; the female spores are large - nearly 0.5 mm - and can be seen by the naked eye. Isoetes live in very moist soils which can be temporarilly stagnant, generally along pond-sides. To determine the species level it is essential to see the ornamentation of the spores (a pocket magnifying glass will suffice).
