Glossary
Terminology Description
Terminology Description
Antheridium a structure that produces motile male gametes (sperm).
Bisexual having both sexes.
Blade a flattened, leaf-like part of the thallus.
Calcar spur subtending a cystocarp.
Carpogonium 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 opisthobranchmollusks (sea slugs) that contain diverticula of the digestive gland.Serve as gills.
Chloroplast a cell organelle specialized for photosynthesis, the production ofcarbohydrates 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) acalcified 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.