| 11. | "Azolla " are weeds in many parts of the world, entirely covering some bodies of water.
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| 12. | Compared to current carbon dioxide levels, these azolla grew rapidly in the enhanced carbon dioxide levels found in the early Eocene.
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| 13. | An abundance of phosphorus, due for example to eutrophication or chemical runoff, often leads to " Azolla " blooms.
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| 14. | At the time this paper was published, four species of " Azolla " had been described from the fossil record.
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| 15. | The sunlight-blocking azolla groves have created " dead zones " in habitats for small fish and other aquatic plant life.
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| 16. | "Azolla filiculoidess " ( Red Azolla ) is the only member of this genus and of the family Azollaceae in Tasmania.
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| 17. | "Azolla filiculoidess " ( Red Azolla ) is the only member of this genus and of the family Azollaceae in Tasmania.
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| 18. | Recent sources include both " Azolla " and " Salvinia " in Salviniaceae, although each genus was formerly given its own family.
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| 19. | It is present in New Zealand as an introduced species and an invasive weed that has crowded out a native relative, " Azolla rubra ".
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| 20. | Like all ferns, sexual reproduction leads to spore formation, but " Azolla " sets itself apart from other members of its group by producing two kinds.
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