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  1. Structure of Organs
    Stems of Sphagnum gametophytes: bear clusters of branches; Stems of gametophytes and sporophytes have a central strand of water-conducting tissue called hadrom (the cells are hydroids) 

    Both branches and stems bear leaves, but stem leaves have little/ no chlorophyll whereas most branch leaves are green

    • Leaves are one cell layer thick and have hyaline cells and narrow green or occasionally red-pigmented living cells
    • Has leptoids which are similar to phloem (the tissue is leptom)

    • When the capsule falls off, it shows the operculum, which falls off and reveals the peristome
  2. Location
    • Epiphytes: may grow on other organisms, but are not parasitic on them
    • Endemic (restricted to limited geographic areas): tropical cloud forests and high temperature places; temperate; many aquatic or dry habitat
  3. Reproduction
    • Sphagnum moss: formation of gametangia (antheridia and archegonia) at ends of special branches at the tips of moss gametophytes; both arch and anth are produced by the same plant 
    • Antheridia clustered in splash cups

    Fertilization in the winter and four months later mature spores are discharged

    • Some gametophytes are unisexual
    • Fragmentation: asexual 
  4. Sporophyte
    Sporophyte: red to blackish-brown capsule (spherical); raised on a pseudopodium; has a short seta; at the top of the capsule is an operculum, separated from the rest of the capsule by a circular groove; foot that is attached to gametophyte tisshe for nourishment
  5. Gametophyte
    First stage of the gametophyte is the protonema (one cell layer thick and resemble filamentous green algae

    Moss gametophytes can be super long or super small; all have multiple multicellular rhizoids and the leaves are one cell layer thick except at the midrib

Card Set Information

2014-04-09 14:39:07
Plant Kingdom
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