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Title: The systematic value of endexine ornamentation in some Psychotrieae pollen (Rubiaceae-Rubioideae)
Authors: Jansen, Steven ×
Robbrecht, E
Smets, Eric #
Issue Date: 1996
Publisher: Scandinavian university press
Series Title: Grana vol:35 issue:3 pages:129-137
Abstract: An examination of the endexine in pollen from 22 species in five genera (mainly African) of the Psychotrieae allows a preliminary survey of endexine Variation in this large tribe. The endexine surface varies from smooth (Chazaliella) to flocky (Chassalia) or granular (Psychotria, Gaertnera and Pagamea). The granulation of the three latter genera is interrupted by endocracks. There are no proper endoapertures, but in Gaertnera and Pagamea, apparent endexine thickenings (''costae'') occur at the polar ends of the mesoapertures. Therefore, endexine characters have systematic importance at the generic level in this tribe. The results also indicate pollen morphological differences between the subgenera Psychotria and Tetramerae of Psychotria.
ISSN: 0017-3134
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Plant Systematics and Ecology Section - miscellaneous
× corresponding author
# (joint) last author

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