<P> Pollen is produced in the microsporangia in the male cone of a conifer or other gymnosperm or in the anthers of an angiosperm flower . Pollen grains come in a wide variety of shapes , sizes , and surface markings characteristic of the species ( see electron micrograph , right ) . Pollen grains of pines , firs , and spruces are winged . The smallest pollen grain , that of the forget - me - not ( Myosotis spp . ) , is around 6 μm ( 0.006 mm ) in diameter . Wind - borne pollen grains can be as large as about 90 -- 100 μm . </P>
<P> Pollen is produced in the microsporangia in the male cone of a conifer or other gymnosperm or in the anthers of an angiosperm flower . Pollen grains come in a wide variety of shapes , sizes , and surface markings characteristic of the species ( see electron micrograph , right ) . Pollen grains of pines , firs , and spruces are winged . The smallest pollen grain , that of the forget - me - not ( Myosotis spp . ) , is around 6 μm ( 0.006 mm ) in diameter . Wind - borne pollen grains can be as large as about 90 -- 100 μm . </P>
where are pollen grains produced in a flower
where are pollen grains produced in a flower
in the microsporangia in the male cone of a conifer or other gymnosperm or in the anthers of an angiosperm flower
in the microsporangia in the male cone of a conifer or other gymnosperm or in the anthers of an angiosperm flower