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fern
(redirected from Pteridophytes)

    Also found in: Dictionary/thesaurus, Encyclopedia, Wikipedia 0.01 sec.
fern
a terrestrial vascular plant of the order Filicales; reproduction is through spores. A few ferns are poisonous. See pteridium aquilinum, equisetum, cheilanthes, dryopteris. Called also pteridophyte.
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Ever since the first chromosome counts of homosporous pteridophytes revealed that they possess astonishingly high numbers of chromosomes, botanists have recognized the unique genomic composition of these plants.
Evolutionary Genomic Analyses of Ferns Reveal that High Chromosome ... by Barker, Michael S. / American Fern Journal
By these estimates, more than 60% of the pteridophytes of Nicaragua are vulnerable, if not greatly threatened, a staggering percentage.
Flora de Nicaragua. Tomo 4. Helechos by Smith, Alan R. / American Fern Journal
These results suggest that pteridophytes have repeatedly evolved a wide variety of drought adaptation strategies (poikilohydry and xeromorphism at least 12 and 6 times, respectively) that are not adequately described by a simple distinction between homoiohydry and poikilohydry.
Desiccation and rehydration experiments on leaves of 43 pteridophyte ... by Kessler, Michael; Siorak, Yvonne / American Fern Journal
 
 
 
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