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Marine Botany
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Monterey
Bay Flora
Methods PHYCOLOGICAL SOCIETY OF AMERICA |
Pugetia fragilissima & Pugetia firmaGlossaryAuxiliary Cell- a cell in the female gametophyte where the nucleus of a fertilized zygote is transferred. Benthic- attached or lying upon the seafloor Carpogonium (pl. carpogonia)- the cell in which the egg nucleus develops and is fertilized. Carpospores- diploid spores produces by carposporophyte generation which develop into the tetrasporophyte generation Carposporophyte- diploid generation produced from the fertilization of the egg, which is limited to tissue growing on the haploid gametophyte generation. Cortex- outer layer of cells. Usually pigmented and smaller than the inner medulla cells. Cruciate- the shape of a cross. Pugetia's tetraspores are four cells that look like a cross and are thus cruciate. Diploid- containing two copies of each chromosome Endophytic- growing within a plant or alga Epiphytic- growing on another plant or alga Fusion cell- the cell produces when an auxiliary cell fuses with its neighbors Gametangial- related to the gametophyte generation Gametophyte- haploid, gamete producing generation Gonimoblast- a filament of the carposporophyte in red algae that bears the carpospores Haplodiplontic- Having a life history that includes both haploid and diploid phases Haploid-containing one set of chromosomes Isodiametric- cells with a relatively equal diameter in all planes Isomorphic- same morphology for all stages of life cycle Medulla- cells found in the central core of multicellular algae. Multiaxial- no clear center axis, but rather lots of filaments, arranged without a concentration around the center. Nonprocarpial- auxiliary cell is not connected to the carpogonial branches Oogamy- female gamete is non-motile egg cell Pit Plugs- small cytoplasm connection between cells in many red algae. May help with nutrient exchange. Ploidy- refers to the number of sets of chromosomes. In Pugetia, the ploidy can be either haploid (n) or diploid (2n). Spermatia- nonmotile male gametes in red algae Supporting Cell- cell that bears one or more carpagonial branches. Syngamy- sexual reproduction by union of gametes Tetraspore- one of four haploid cells produced by the tetrasporophyte, it develops into gametophyte generation. Tetrasporophyte- Diploid generation in Rhodophyta derived from carpospore. Produces tetraspores. Thallus (pl. thalli)-an organism's body (algae or fungi), not differentiated into roots, stems, leaves Trichogyne-extention off the carpogonia to collect spermatia. Triphasic- three phase life history. In Rhodophyta this includes the gametophyte generation, the carposporophyte generation and the tetrasporophyte generation. Thylakoid- saclike membranous structure in plastids of algae where the processes of photosynthesis occur. Uniaxial-having one axis with one apical cell at its tip. Upwelling- surfacing of deeper,
often cold and nutrient rich water, due to wind movement. ~Most of these definitions come from Paul Gabrielson, et al. (2004) ~ © 2005 Laure Sierra Katz. |
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