Fresh market blackberries can feel “seedy” when consumed. This “seediness” is associated with the presence of pyrenes which are comprised of a single seed enclosed in an endocarp. Small pyrene size (
Sebesta, Bethany; Clark, John R.; Threlfall, Renee T.; and Howard, Luke R.
"Characterization of seediness attributes of blackberry genotypes,"
Discovery, The Student Journal of Dale Bumpers College of Agricultural, Food and Life Sciences. University of Arkansas System Division of Agriculture. 14:72-79.
Available at: http://scholarworks.uark.edu/discoverymag/vol14/iss1/13