Which of the following descriptions fits best?
Corylus; e.g. C. avellana
triporate, without vestibulum; more or less triangular pollen grain tetrad; tricolpate or tricolporate; psilate, scabrate or verrucate tricolporate with distinct pores with costae; irregularly scabrate, round, large pollen grain
tetrad; tricolpate or tricolporate; psilate, scabrate or verrucate
tricolporate with distinct pores with costae; irregularly scabrate, round, large pollen grain
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