HOW TO KNOW THE FRESH-WATER ALGAE 



within the cell wall, open 

 at one side to form a 

 cup. Fig. 347 



Figure 347 



CUSHION: a pad; a thick- 

 ened plate. 



Cyanoderrr.a bradypodis 1 3 



Cyanophyta 7, 12, 139, 158, 

 183 



Cyc/onexis 1 55 

 annulatus 1 55 



Cyclops 52 



CYLINDRICAL: a figure, 

 round in cross section, 

 elongate with parallel lat- 

 eral margins when seen 

 from the side, the ends 

 square or truncate. See 

 subcylindrical. 



Cylindrocapsa 1 08 



geminella var. minor 108 



Cylindrocystis 71; also 72 

 Brebissonii 71 



Cylindrospermum 1 70 

 ma jus 1 70 

 marchicum 1 70 



CYST, a thick-walled rest- 

 ing cell or stage of an 

 organism. 



Cystodinium 1 49 

 cornifax 149 



Dacry/ococcops/'s 1 84 



acicularis 184 



-fascicularis 184 

 Docty/ococcus 52, 58 



infusionum 52 

 Dactylothece 44; also 78 



confluens 44 

 Dasyg/oea 165 



amorpha 165 



DAUGHTER CELLS:, cells pro- 

 duced directly from the 

 division of a primary or 

 parent cell; cells produced 

 from the same mother 

 cell. 



DAUGHTER COLONY: a 

 group of cells closely ar- 

 ranged, having been 

 formed from the division 

 of a parent cell. 



Debarya 96 



Derepyxis 147 

 dispar 1 47 



Dermatophyton, synonym of 

 Ulvella, 1 1 5 



Desmatractum 68, 77 

 bipyramidatum 68 



Desmidium 90; also 89 



Bailey i 90; also 89 



Grevillii 90 

 Desmids, 15, 46, 63, 69, 



72, 78, 89-91 

 Desmonema 175 



Wrangelii 175 

 Diachros 136, 143 



simplex 1 36 

 Diatoms 7, 11, 12, 145, 186 

 Dichothrix 167 



gypsophila 167 

 Dichotomosiphon 1 23 



ruberosus 123 



DICHOTOMOUS: dividing or 



branched by repeated 



forkings, usually into two 



equal parts, or segments. 

 Dicranochaete 51, 67 



reniformis 51 

 Dictyosphaerium 47; also 60 



Dulchellum 47 

 Dirr.orphococcus 47, 60 



cordatus 47 



lunatus 47 

 Dinobryon 145, 146, 155, 



156; also 2, 22 



sertularia 145 

 Dinoflagellatae 2, 8, 11, 14, 



82, 149 

 Diplocolon 175 



Heppii 175 

 DISC; DISC-SHAPED: a flat 



(usually circular) figure; 



a circular plate. 

 Dispora 49 



crucigenioides 49 



DISTAL: the forward or an- 

 terior end or region as 

 opposed to the basal end. 



Division (of the plant king- 

 dom) defined, 4 



Docidium 7 1 

 Baculum 7 1 

 undulatum 71 



DORSAL, the back or upper 

 surface or part as opposed 

 to the under or lower 

 (ventral) surface of a cell 

 or organism. 



DORSIVENTRAL: referring 

 ro differentiation into an 

 upper (dorsal) and a low- 

 er (ventral) surface or 

 side. 



Draparnaldia 123 

 glomerata 1 23 



Draparnaldiopsis 123 



Drying Specimens, 16 



Dunaliella 36 

 salina 36 

 viridis 36 



DWARF MALE: a minute 

 male plant (as in the 

 Oedogoniaceae) growing 

 on or near the female 

 sex organ (oogonium) in 

 a larger filament. 



tchinosphaerella 78; also 79 



limnetica 78 

 Economic Importance 1, 2 

 Elakatothnx 39, 42, 50; 



so 78 

 ame r /cana 

 gelatinosa 

 viridis 39 



ELLIPSOID: 



al- 



39 

 39 



an ellipse, a 

 plane figure with curved 

 margins which is elongate, 

 the poles more sharply 

 rounded than the lateral 

 margin. Fig. 348 



ECCENTRIC: arranged with- 

 out a common center; lo- 

 cated to one side of cen- 

 ter 



Figure 348 



ENCYSTED: See cyst. 



ENDOPHYTE: living within 

 the cells or internally 

 among the cells of a 

 plant. 



ENDOSPORES: non - motile 

 spores, indefinite in num- 

 ber, cut out from within 

 a plant cell, or (as in 

 Chamaesiphon) cut off 

 from the tip of the pri- 

 toplast and liberated one 

 by one. 



ENDOZOIC: living within the 

 cells or among the tis- 

 sues of an animal. 



Enteromorpha 98 

 intestinalis 98 



Entocladia 112, 114 

 polymorpha 1 1 2 



EPIPHYTE: living upon a 

 plant, sometimes living in- 

 ternally also. 



EPIZOIC: living on or at- 

 tached to an animal. 



Eremosphaera 8 1 

 viridis 8 1 



Errerella 57 



bornhemiensis 57 



Euastropsis 36; also 55 

 Richteri 36 



Euastrum 75, 77; also 6 

 pectinatum var. inevolu- 



tum 75 

 oinnatum 75 



Eudonna 29; also 26 

 elegans 29 

 unicocca 29 



Euglena 25, 13 0; also 10, 

 23, 52 



convoluta 25 

 elastica 25 



Euglenaceae 2 



Euglenophyta 7, 10, 23 



EUPLANKTON: true or open- 

 water plankton (floating) 

 organisms. See plankton. 



Excentrosphaera 83 

 viridis 83 



EYE-SPOT: a granular or 

 complex of granules (red 

 or brown) sensitive to light 

 and related to response 

 to light by swimming or- 

 ganisms. 



202 



