outline: describes the contour of pollen grains in polar and/or equatorial view
CITATION STYLE
Halbritter, H., Ulrich, S., Grímsson, F., Weber, M., Zetter, R., Hesse, M., … Frosch-Radivo, A. (2018). Shape and Polarity. In Illustrated Pollen Terminology (pp. 155–205). Springer International Publishing. https://doi.org/10.1007/978-3-319-71365-6_8
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