Which of the following descriptions fits best?
Betula sp.; e.g. B. pendula
triporate with distinct vestibulum; more or less round pollen grain pantoporate, annulus around pores not visible; psilate pantoporate with wide annulus around pore; scabrate to reticulate
pantoporate, annulus around pores not visible; psilate
pantoporate with wide annulus around pore; scabrate to reticulate
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