Bryophytes213-page8 - embedded in the archegonium. At...

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Bryophytes - 8 All liverworts exhibit the basic alternation of generations. Meiosis produces half male and half female spores, so that a gametophyte is either male or female. In Marchantia , for example, the archegonia and the antheridia are elevated above their respective thallus structures on stalks called archegoniophores and antheridiophores. Several archegonia and antheridia are found in each stalk. Other thallose liverworts will have the antheridia and archegonia embedded in the thallus tissue, rather than on stalks. Archegoniophores Archegonia Antheridiophores Antheridia The sporophyte is a simple club-shaped sporangium that grows from a basal foot
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Unformatted text preview: embedded in the archegonium. At maturity, the sporangium splits open, and the release of spores is assisted by special hygroscopic hairs, called elaters. Young Sporophyte Mature Sporangium Spores with elaters Vegetative Reproduction Vegetative reproduction is common in the liverworts. Fragmentation of the gametophyte is common. Many thallose liverworts produce gemmae cups containing multicellular propagules, gemmae. Gemmae are dispersed when rain splashes the gemmae cup....
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This note was uploaded on 01/08/2012 for the course BIO 213 taught by Professor Makina during the Fall '09 term at SUNY Stony Brook.

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