Diffluent: flowing off; dissolving away. 



Diploid: referring to nucleus with double number of chromosomes; a generation 

 of plant life cycle before reduction division (cf. haploid). 



Disarticulate: unjointed; with segments separated. 



Disc ( Discoid ) : a circular, flat body; a plate. 



Dissepiment: a cross partition; a cross wall. 



Distal: referring to the forward end; opposite from basal. 



Distromatic: occurring in two layers, or at two levels. 



Divaricate: widely separating; spreading. 



Diverging: extending from a common point in different directions. 



Dolioform: barrel-shaped. 



Dwarf male: a 1-celled or few-celled male plant epiphytic on the female, 

 usually on or near the oogonia. 



Echinate: spiny. 



Egg: female gamete; non-motile heterogamete. 



Emarginate: a margin which is not even, but notched or with concavities. 



Endocellular: within the cell. 



Endogenous: arising from within. 



Endophyte { Endophytic): plant living within another plant but not neces- 

 sarily parasitic. 



Endospore: a spore formed within a cell; a spore cut off from the tip of a 

 protoplast as in Chamaesiphon. 



Endozoic: living within an animal but not necessarily parasitic. 



End piece: the unsheathed tip of a flagellum; a tail piece. 



Entire: smooth, not toothed or roughened. 



Envelope: a sheath or mass of mucilage which incloses a cell or colony. 



Epicone: the upper or anterior half of a dinoflagellate cell. 



Epiphyte ( Epiphytic ) : plant growing on another plant but not necessarily 

 parasitic. 



Epitheca: the part of the cell wall of a dinoflagellate above the transverse 

 furrow. 



Epivalve: the upper or larger of the two parts of the wall of diatom cells; 

 sometimes the upper part of dinoflagellate cells. 



Epizoic: attached to or growing on animals. 



Erect oogonium: oogonium (in the genus Bidbochaete) borne at the end of 

 a suffultory cell ( q.v. ) that has been divided by a transverse wall. 



Euplankton: true plankton; open-water drifting organisms. 



Eutrophic: referring to older, shallow lakes; highly productive. 



Evanescent: disappearing, vanishing, especially with advanced age. 



Evection: to set aside or to push one part above another. 



Excentric ( or Eccentric ) : off center. 



Exospore: the outer membrane of a zygospore wall. 



Eye-spot: pigment-spot; granule which is sensitive to light and usually dark 

 red in color; found in some swimming spores or in motile vegetative cells. 



False branch: a branch formed by a slipping to one side of a section of a fila- 

 ment; a branch not formed by lateral division of a cell. 



Family: an aggregation of cells or of similar plants. 



Fascicle ( Fasciculate ) : a bundle or cluster. 



Fastigiate: narrowed to a point. 



Fenestrate (Fenestration): windowed; with openings. 



Fibrils (Fibrillate, Fibrillose):Rne fibers; slender strands. 



Filament: a linear arrangement of cells; thread of cells, together with sheath 

 ( Myxophyceae ) . 



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