Abstract
A survey of recent and fossil zona-aperturate pollen grains within the angiosperms was undertaken. Zona-aperturate pollen (with complete ring-like apertures) has been evolved independently in several genera of basal angiosperm families (Nymphaeaceae, Eupomatiaceae, Annonaceae, Monimiaceae, Atherospermataceae) and monocots (Araceae, Iridaceae, Laxmanniaceae, Arecaceae, and Rapateaceae). The special case of the eudicot Limnanthes (Limnanthaceae) is discussed. New examples of recent and fossil fully zonate pollen are presented; a noteworthy new example are Scrophulariaceae, with Pedicularis; our fossil examples show affinities either to Nymphaeaceae, or Araceae, or Iridaceae, or cannot be related to an extant taxon. The zona-aperturate pollen grains differ in ornamentation and stratification mostly in the respect of the aperture areas, but sometimes also outside the aperture. The question of polarity is settled only for some taxa because of the frequent lack of tetrad observations. A ring-like aperture may divide the pollen grains in symmetric halves, or if running asymmetrically, divides the pollen grain in two more or less unequal halves; the presence of clearly unequal halves gives a strong argument to assume an equatorial ring in such cases where tetrad configurations were not available. The zona-aperturate condition may be a functional benefit in wet environments: while in dry pollen the apertural ring is completely closed, in wet or very moist realm it expands greatly, and the pollen tube can be formed quickly and everywhere in this area.
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Hesse, M., Zetter, R. Ultrastructure and diversity of recent and fossil zona-aperturate pollen grains. Plant Syst. Evol. 255, 145–176 (2005). https://doi.org/10.1007/s00606-005-0358-9
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DOI: https://doi.org/10.1007/s00606-005-0358-9