@Article{biocell.2008.32.049,
AUTHOR = {GEORGINA M. DEL FUEYO, Marta A. CACCAVARI, ELIZABETH A. DOME},
TITLE = {Morphology and structure of the pollen cone and pollen grain of the <i>Araucaria</i> species from Argentina},
JOURNAL = {BIOCELL},
VOLUME = {32},
YEAR = {2008},
NUMBER = {1},
PAGES = {49--60},
URL = {http://www.techscience.com/biocell/v32n1/37733},
ISSN = {1667-5746},
ABSTRACT = {The pollen cone and the pollen grain of the two Argentinean species of <i>Araucaria</i> are described with LM, SEM and TEM. Primordia of pollen cones are formed in April and May and reach maturity by mid-October in <i>A. angustifolia</i> (Bert.) O. Kuntze and by mid-November in <i>A. araucana</i>. (Mol.) K. Koch. Characters of the mature pollen cones and microsporophylls between both taxa are clearly differentiated. Pollen grains are spheroidal-subspheroidal, inaperturate, and asaccate with granulate exine and a subequatorial annular area that corresponds to the sexine thickness. Sculpturing consists of irregularly dispersed granules that are sometimes fused to each other (<i>A. angustifolia</i>) or forming microrugulae (<i>A. araucana</i>). Microgranules and microspinules are also present. The pollen wall ultrastructure is formed by a granular ectexine and lamellated endexine. Granular elements in <i>A. angustifolia</i> are more loosely disposed, form more interstices, and are gradually smaller towards the endexine than in <i>A. araucana</i>. To asses the probable relationships within the family, we compared the pollen grains of the two <i>Araucaria</i> species with those of other extant genera (<i>Agathis, Wollemia</i>) and also with fossil pollen (<i>Araucariacites, Balmeiopsis, Cyclusphaera, Dilwynites</i>) attributed to Araucariaceae.},
DOI = {10.32604/biocell.2008.32.049}
}