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  1. Structure
    Some small with undivided leaves

    Some tree ferns are super large

    The fern embryo of some proudces a true root which wthres and the rest of the roots arise from the rhizomes near the bases of the leaves

    Leaves= fronds are megaphylls (large leaves)

    Fronds can be compounded into pinnae that are attached to the petioles

    Young leaves are coiled= fiddleheads

    Both fiddleheads and rhizomes are usually clothed with either heads or scales

    The leaves of Marsilea resemble those of a four-leaf clover

    Drought resistant, bean-shpaed reproductive structures called sporocarps germinate when placed in water
  2. Location
    tropics but some in temperate regions
  3. Gametophyte
    Some gametophytes are subterranean, tuberous elongated with numerous rhizoids; others have vascular tissue

    The gametophytes are bisexual, bearing both antheridia and archegonia

    The gametophyte typically develops rapidly into a flat, heart-shaped, usually membranous structure (prothallus) that has numerous rhizoids on the lower surface

    Both anth and arch develop on the lower surface of the prothallusAntheridia more common among rhizoids; archegonia formed near notch
  4. Sporophyte
    • Sporangia commonly occur in clusters called sori, which are colored dots or lines on the lower surface of the frond
    • The sori are covered by specialized outgrowths of the leaf, the indusial
    • Spores give rise to free-living, potentially bisexual gametophytes

    Sporophyte has a foot embedded in gametophyte

    Sporophyte is the perennial stage in ferms and the gametophyte is short-lived

Card Set:
2014-04-09 16:14:58
Plant Kingdom
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