BIOL 1130 Lecture Notes - Isoetes, Microphyll, Sporangium
27 Sep 2013
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4 phyla psilotophyta, lycophyta, equisetophyta, polyodiophyta. These plants were dominant in the carboniferous period (vegetation) Present in the equator when conditions were hot & moist. Life cycle alternation of generations: a) independent life forms haploid & diploid, b) sporophyte phase most obvious (2n, spores not seeds but have vascular systems protostelem. Stem branching dichotomous branching ** picture** They have in terms of the sporocytes, will produce 1 type of spore called homospores. Sporangia on upper parts of the stem. Sporangia meiosis spores (n) from the 2n sporocytes. Spores germinate form very small (feminine l v u) gametophyte. Will produce female archegonia (egg) + male antheridia (sperm) Fertilization occurring zygote germinates and produce the mature whish fern sporophyte (2n) Often has stroboli that contain non-photosynthetic leaves that bear the sporangia. Sporangia fertile tissue within the sporophyte. Male antheridia(sperm) , female archegonia (egg) Resemble lycopodium but are heteopsorus produce 2 gametophyte (male. Microsporocytes (m mirosperm [meiosis] female.
