The pollen grains of Quercus coccifera s.l. are characterized by a lined exine made up to long flat plicae with abundant perforations of the tectum (SMIT, 1973) and a long colpus with a membrane, rugulate edges and evident porus (MARIANI COLOMBO, CHIESURA LORENZONI, GRIGOLETTO, 1983). This morphology was only rarely observed in the grains collected from numerous plants in certain places in Italy, during spring flowering as well as other periods. They occasionally present a very smooth exine, or, more frequently, an exine densely covered by Verrucae with a scabre surface, and crossed outside by microrugulae. In few cases even the colpus is larger. We think that these variations of exine structure together with grains measurements of polar and aequatorial axes may suggest an introgressive hybridization between different subgenera. © Taylor & Francis Group, LLC.

Taxonomic importance of the pollen grain morphology in «quercus coccifera» s.l: Importanza tassonomica della morfologia dei granuli pollinici in «quercus coccifera» s.l

Defrancesco E.
1984

Abstract

The pollen grains of Quercus coccifera s.l. are characterized by a lined exine made up to long flat plicae with abundant perforations of the tectum (SMIT, 1973) and a long colpus with a membrane, rugulate edges and evident porus (MARIANI COLOMBO, CHIESURA LORENZONI, GRIGOLETTO, 1983). This morphology was only rarely observed in the grains collected from numerous plants in certain places in Italy, during spring flowering as well as other periods. They occasionally present a very smooth exine, or, more frequently, an exine densely covered by Verrucae with a scabre surface, and crossed outside by microrugulae. In few cases even the colpus is larger. We think that these variations of exine structure together with grains measurements of polar and aequatorial axes may suggest an introgressive hybridization between different subgenera. © Taylor & Francis Group, LLC.
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11577/3421246
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