pollen grains have a large number of pores (8 -14), each
surrounded by a thickened, projecting ring known as an
annulus, and with a plug in the centre termed an operculum.
Grains are round with a thin cobbly wall, a network of
small hills and valleys, with large irregular verrucae
(Andrew, 1986, Moore, et al, 1991). Faegri & Iversen (1975)
have published a pollen key for the Plantaginaceae.
View Uppsala University images of Plantago lanceolata
by clicking here
photo of a Plantago lanceolata grain