Which of the following descriptions fits best?
Alnus sp.; e.g. A. glutinosa
zonoporate (four to six pores), pentagonal pollen grain; thickened arches (arcus) from pore to pore, visible as bands; protruding pores with a wide vestibulum; psilate triporate with distinct vestibulum; more or less round pollen grain pantoporate, but pores clustered around one pole; psilate to scabrate
triporate with distinct vestibulum; more or less round pollen grain
pantoporate, but pores clustered around one pole; psilate to scabrate
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