An areola, especially a small area bearing spines or hairs on a cactus.
- The spines grow from an areole covered with glochids, which are tiny, barbed spines characteristic of all Opuntia.
- Such gas exchange measurements, which were performed on the same fruits throughout their development, were done during clear days, on east-facing unshaded fruits, and avoiding the areoles.
- The surface of the cell is coarsely areolate, with a pore in each areole.
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