Antheridium (pl. antheridia): a structure that produces motile male gametes (sperm). Ascoglossan: referring to the order Ascoglossa (=Sacoglossa), an order of sea slugs (Mollusca: Gastropoda: Opisthobranchia). Bisexual: having both sexes. Blade: a flattened, leaf-like part of the thallus. Calcar: spur subtending a cystocarp. Carpogonium (pl. carpogonia): the female sex structure in red algae. Carpospore: a spore, usually diploid, produced in the carpogonium. In red algae, it grows into a free-living tetrasporophyte. Cerata: dorsal appendages on some opisthobranch mollusks (sea slugs) that contain diverticula of the digestive gland. Serve as gills. Chloroplast: a cell organelle specialized for photosynthesis, the production of carbohydrates from carbon dioxide, water in the presence of light energy. Coenocytic: referring to a multinucleate cell, the coenocyte, derived when the nucleus divides but the cytoplasm does not. Conceptacle: a fertile cavity, often with a pore. Cortex: tissue external to the medulla, often an outer covering, of a blade. Cryptostomata: minute cavities in the outer cortex of Fucales containing hairs. Cystocarp: a structure in the female gametophyte of red algae consisting of diploid carposporophyte surrounded by gametophytic tissue. It may be a pigmented bump with or without an ostiole. Dichotomous: branching in pairs. Dioecious: bearing male and female reproductive structures on separate individuals. Diploid: having a normal (double or 2n) set of chromosomes. Discoid: disk shaped. Usually referring to the shape of holdfasts. Distichous: arranged in two rows on opposite sides of an axis. Distromatic: having two layers of cells. Gametangium (pl. gametangia): a structure that produces gametes. Euryhaline: able to withstand a wide range of salinities. Eurythermal: able to withstand a wide range of temperatures. Filamentous: a row of cells arranged end to end forming a hair-like thallus. Gamete: a sexual cell, male or female (e.g., sperm and eggs). Gametophyte: the haploid and sexual phase in the life history of an alga; produces gametes. Haploid: having a single set of chromosomes - half the normal number (1n). Herbivory: feeding on plants. Holdfast: the structure that attaches the alga to its substratum. Intercallary: occurring anywhere along the thallus except at the apex. Intergeniculum (pl. intergenticula): a calcified segment between the uncalcified joints of coralline algae. Isomorphic: having the same shape; looking alike. Lanceolate: shaped like a lance; several times longer than wide. Laminarin: a polysaccharide carbohydrate energy storage product in Laminaria. Meristem: a region of rapidly dividing, undifferentiated cells; an area of growth. Midrib: the middle rib of a blade. Monoecious: bearing male and female reproductive structures on the same individual. Monostromatic: having one layer of cells. Oogonium: a female reproductive cell (gametangium) that produces one or more female gametes (eggs). Ostiole: a pore. Ovate: egg-shaped. Papilla (pl. papillae): small rounded or pimple-like projections on a surface Pericentral: surrounding central axial cells. Pinnate: having similar parts arrange on opposite sides of an axis, like a feather. Plastid: a pigmented cell organelle (e.g., a chloroplast which contains chlorophyll). Pneumatocyst: a gas bladder or float of brown algae. Receptacle: the inflated tip of a branch that holds conceptacles (e.g. the swollen tip of Fucus). Rhizoid: a unicellular or filamentous structure for attachment. Rhizome: a horizontal, shoot-producing stem growing within the substrate. Saxicolus: growing on rocks. Spermatangium (pl. spermatangia): a cell in red algae that produces a single, nonflagellated, male gamete (the spermatium). Spore: a motile or nonmotile, asexual reproductive structure. Sporophyll: the part of the alga, usually a blade, which bears sporangia, the structure that produces spores. Sporophyte: the diploid phase in the life history of the alga; produces spores. Sorus (pl. sori): a cluster of reproductive structures. Stipe: the stem-like part of the thallus between the holdfast and the blade(s). Stolon: a runner growing out of the base of the alga capable of producing offshoots. Substratum: the material (such as rock) on which the alga is growing (substrate). Tetraspore: a spore, grouped in fours, produced by tetrasporophytes Tetrasporophyte: a phase in the life history of red algae that produces tetraspores. Tertiary: referring to a third stage. Thallus: the body of the alga. Uniseriate: having a single row of cells. Utricle: the inflated part of Codium that contains plastids. Vegetative: not associated with reproductive cells or sexual reproductive capacity. Zygote: a fertilized egg cell.
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