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howcrcr, these grains are exceedingly prolate.'rlie csine increases markedly in thickness to the poles.The sesitic pattern of G. espansci, G. piilclircc (1'1.9: 1 4 ) , G. rhorlcintha and G .serrct resembles G. siibocctilta, G. triphylla and G. vcifchioritm.G. s:echenyii(I'I.11: 3-4) has pollen grains less distinctly striate than the above mentioned species.The lirae are more closely spaced.Similar pollen grains are found in G. ceplialantha, G. stipitata and G. fizuensis.1 c-1 c). 5 -669543 Cram Pal.1-01.
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Siwert Nilsson (1967) studied this question.
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