GEORGINA M. DEL FUEYO1, Marta A. CACCAVARI1,2, ELIZABETH A. DOME1
BIOCELL, Vol.32, No.1, pp. 49-60, 2008, DOI:10.32604/biocell.2008.32.049
Abstract The pollen cone and the pollen grain of the two Argentinean species of Araucaria are described with LM, SEM and TEM. Primordia of pollen cones are formed in April and May and reach maturity by mid-October in A. angustifolia (Bert.) O. Kuntze and by mid-November in A. araucana. (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 (A.… More >
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