GLOSSARY 131 



Discoid (adj). Disc shaped. 



Epitheca, epithecae (n). The larger or epivalve of a diatom cell; part of the wall of a 



dinoflagellate, anterior to the transverse furrow. 

 Euplankton (n). True plankton. 



Eyespot (n). A small pigmented photosensitive body in certain flagellated algal cells. 

 Fascicle (n), fasciculate (adj). A bundle or cluster. 

 Filament (n), filamentous (adj). A linear arrangement of cells. 

 Flagellum, flagella (n), flagellate (adj). A fine long threadlike structure having 



lashing or undulating movement, projecting from a cell; it is used for locomotion. 

 Frustule (n). A diatom cell; the silicified wall of the diatom cell. 

 Furcate (adj). Forked. 

 Fusiform (adj). Spindle shaped. 

 Gamete (n), gametic (adj). A sex cell. 



Gelatinous (adj). Having a jellylike or mucilagelike texture or appearance. 

 Gibbose (adj). Swollen on one side. 



Girdle (n). A ring or band connecting two valves in diatoms; a transverse groove. 

 Globose (adj). Ball shaped or nearly so. 



Granulate, granulose (adj). Composed of or appearing to be covered with granules. 

 Gullet (n). An anterior opening of flagellates. 

 Heterocyst (n). A metamorphosed vegetative cell in diatoms; sometimes forms en- 



dospores or a filament. 

 Heterothallus (n), heterothallic (adj). A species in which gametes unite only if arising 



from different plants. 

 Homothallus (n), homothallic (adj). A species in which gametes unite only if arising 



within the same plant. 

 Hormogonium, hormogonia (n). A short, distinct section of a trichome that produces a 



new plant vegetatively. 

 Hyaline (adj). Colorless and transparent. 

 Hypotheca, hypothecae (n). The small or hypovalve of a diatom cell; part of the wall of a 



dinoflagellate, posterior to the transverse furrow. 

 Inflated (adj). Swollen. 



Intercalary (adj). Between or inserted between cells. 

 Isodiametric (adj). Having equal diameters. 

 Isogamy (n), isogamous (adj). Sexual union of two flagellated or nonflagellated 



gametes of equal size. 

 Keel (n). A projecting ridge. 



Laminate (adj). Consisting of or shaped like plates. 

 Lanceolate (adj). Lance shaped. 

 Linear (adj.). Straight; narrow and long. 

 Lorica (n). A firm covering that is not connected to the protoplast and contains an 



anterior opening. 

 Lunate (adj). Crescent shaped. 

 Macrophyte (n). Large plants that can be seen without magnification; includes mosses 



and seed plants. 

 Mucilage (n). A thick, watery substance. 

 Multiseriate (adj). Occurring in several rows. 

 Naviculoid (adj). Boat shaped. 

 Nodule (n). A small knob. 

 Obcuniform (adj). Inversely wedge shaped. 



Obovoid (adj). Inversely ovoid, with the broader end anterior or outermost. 

 Oogamy (n). oogamous (adj). Sexual union of a small motile male gamete (sperm) with a 



large nonmotile female gamete (egg). 



