Aerophytic – plant or alga that derives moisture and nutrients from the air and rain; usually growing on other leaves or stems of plants, but also on other substrates such as rocks.
Akinete – a thick-walled resting spore, produced through the differentiation of a vegetative cell, and functioning in asexual reproduction
Amyloplast – colorless, starch-storing plastid
Anisogamous – flagellate gametes of different sexes being different in size, the females being larger than the males
Annular – ring-shaped
Antheridium – male reproductive structure
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