Bryophytes213-page10 - surface of the gametophyte thallus...

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Bryophytes - 10 Anthocerophyta (Hornworts) Main Recognition Features Rounded thallose-like gametophyte "Horn-shaped" sporophyte grows from a basal sheath beneath the surface of the gametophyte thallus. Hornworts have rounded, small, thallose-like gametophytes which are found in moist shaded soils. The gametophytes may be unisexual or bisexual, depending on the species. Most cells have just one chloroplast, aligning them with the presumed ancestral Charophytes. Hornworts are less common than liverworts or mosses, with only about 100 species identified. Some are found in Washington. Life History and Reproduction The sporophyte is "horn-shaped", and grows from a basal sheath beneath the
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Unformatted text preview: surface of the gametophyte thallus. Sporophytes are photosynthetic and contain stoma for gas exchange. Anthoceros Sporophyes Developing Sporophyte Sporophyte, xs and ls Stoma The sporophyte continues to grow from a basal meristem, producing meiotic spores clustered around a central stalk. The sporophyte tip splits releasing spores. Spores continue to mature for some time, and the Sporophyte continues to split from the tip as it grows from the base. Vegetative Reproduction Vegetative reproduction occurs in the hornworts by fragmentation....
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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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