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Unformatted text preview: & m archegoniu w/ leaf big into grows es gametophyt into grow spores release meiosis Sporangium mitosis First group to evolve: o Megaphyll big leaf and o Sporophyll spore-producing structur Annulus ridge of cells along sporangium (has really thick cell walls). They disperse the spores by shrinking when it gets dry. Hermaphroditic Has both sexual organs on the same plant Archegonium and Antheridium develop at different time in order to avoid self-fertilization Life Cycle of a Pine produces two types of cones: ovulate and pollen cones both are proguced in sporangia megasporangium produces spores are multicellular and made up of 4 cells o prothallial cells dont do anything o the other two...
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- Fall '07