prepollen

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prepollen — Microspore with a proximal aperture but without a distal aperture; cycad pollen is considered an intermediate form between prepollen and ‘conventional’ pollen … Expanded glossary of Cycad terms
Zoidogamy — is a type of plant reproduction in which male gametes (antherozoids) swim in a film of water to the female gametes. Zoidogamy is found in algae, bryophytes, pteridophytes, and some gymnosperms (others use siphonogamy). Zoidogamy is interesting… … Wikipedia
Palmfarne — Cycas circinalis, junger (zentral stehend) und alter (zur Seite hängend) männlicher Zapfen. Systematik ohne Rang: Charophyta … Deutsch Wikipedia
pollen — , pollen grain. Fine powdery material (microspores) shed from the microsporangia of seed plants; in cycads sometimes referred to as prepollen; microspores containing a male gametophyte (microgametophyte) … Expanded glossary of Cycad terms

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