HOW TO KNOW THE FRESH-WATER ALGAE 



Chondrocystis 1 77 

 Schauinslandii 177 



CHROMATOPHORE: b o d y 

 within a cell containing 

 the pigments of which 

 some one other than 

 chlorophyll (green) is pre- 

 dominant; may be red, 

 yellow, yellow-green or 

 brown. 



Chroococcaceae 178 



Chroococcus 1 80 

 limneticus 1 80 

 limneticus var. distans . 



180 

 Prescottii 1 80 

 turgidus 1 80 



Chroomonas 1 50 

 Nordstedtii 1 50 



Chrysamoeba 148, 156 

 radians 1 48 



Chrysidiastrum 1 56 

 catenatum 1 56 



Chrysocapsa 1 57 

 paludosa 1 57 

 planctonica 1 57 



Chrysophyceae 144 



Chrysophyta 7, 11, 22, 63, 

 68, 124, 128, 131, 132, 

 134, 135, 139, 144, 148 



Chrysosphaerella 1 54 

 longispina 1 54 



Chrysostephanosphaera 1 57 

 globulifera 1 57 



Chrysostrella 1 46 

 paradoxa 1 46 



CILIA: fine, hair-like exten- 

 sions of a cell membrane 

 used as organs of locomo- 

 tion or for feeding in the 

 Protozoan Class, Ciliata. 



CILIATA: a Class of the 

 Protozoa, swimming by 

 means of numerous, fine, 

 hair-like extensions of the 

 cell membrane. 



Citrus, trees as hosts for 

 algae, 1 1 5 



Cladophora 120, 121; also 

 102 



Cladophora Balls 120 



Cladophoraceae 67 



Class, defined 4 



Closteridium 65 

 lunula 65 



Closteriopsis 69 

 longissima 69 



Closterium 63, 68, 70, 72; 

 also 65, 69 



Coccomyxa 40, 44 

 dispar 40 



Coccomyxaceae 78 



Cocconeis 188 

 Pedi cuius 188 



Coelastrum 58 

 cambricum 58 

 microporum 58 



Coelosphaerium 182, 185; 

 also 67 



Kuetzingianum 182 

 Naegelianum 1 82 



COENOCYTIC: a plant with 

 multinucleate cells or cell- 

 like units; a multinucleate 

 non-cellular plant, e. g. 

 Vaucheria (See Fig. 199). 



Coenogonium 1 09 



Colacium 52, 100 

 arbuscula 52 



Coleochaetaceae 51 



Coleochaete 97, 112, 114, 

 122 



Nitellarum 97 

 orbicularis 97 

 soluta 97 



COLLAR: a thickened ring 

 or neck surrounding the 

 opening into a shell 

 through which a flagel- 

 lum projects from the in- 

 closed organism. 



Collecting 12, 14, 15 



COLONIAL MUCILAGE: a 

 gelatinous investment or 

 sheath which incloses 

 several to many cells. 



COLONY: a group or close- 

 ly associated cluster of 

 cells, adjoined together 

 or merely inclosed by a 

 common investing muci- 

 lage or sheath; cells not 

 arranged in a linear ser- 

 ies to form a filament. 



COLUMNAR CELLS: See 

 corticating cells. 



Compsopogon 1 26 

 coeruleus 1 26 



CONCENTRIC: arranged 

 about a common center. 



CONE-SHAPED; CONICAL: a 

 figure circular in cross 

 section, broad at the base 

 and tapering symmetrical- 

 ly from base to apex. 



CONFLUENT: running to- 

 gether or intermingling, 

 as mucilaginous sheaths 

 of plants becoming in- 

 termingled. Fig. 344 



V \ l I 



\ w 



i I 



i I 



I) 



Figure 344 



CONJUGATION: sexual re- 

 production between cells 

 which become joined or 

 "yoked" together, the 

 gametes (sex cells) mov- 

 ing in an amoeboid fash- 

 ion. Fig. 34o 



CONJUGATION TUBES: 

 tubes which are put out 

 by one or both cells in 

 sexual reproduction pro- 

 viding for the uniting of 

 gametes; see Conjugation. 



CONSTRICTED: cut in or 

 incised, usually from two 

 opposite points on a cell 

 so that an isthmus is 

 formed between two parts; 

 indented, as are the lat- 

 eral walls of cells of a 

 filament at the cross 

 walls. Fig. 346 



Figure 345 



Figure 346 



CONTRACTILE VACUOLE: a 

 small vacuole (cavity) 

 which is bounded by a 

 membrane that pulsates, 

 expanding and contract- 

 ing. 



Copepod 2 



Coronastrum 42, 51 

 aestivale 42 



CORTEX; CORTICATING 

 CELLS: cells superim- 

 posed on the main fila- 

 ment or axial part of a 

 plant body; investing cells, 

 e. g., Chara, Batracho- 

 sperrr.um. (See Fig. 2) 



Cosmarium 76; also 6, 75, 

 88, 89, 99 

 margaritatum 76 

 panarhense 76 



Cosmocladium 46 

 tuberculatum 46 . 



CRENULATE: wavy with 

 small scallops; with small 

 crenations. 



CRESCENT: an arc of a 

 circle; a curved figure 

 tapering to horn - like 

 points from a wider, 

 cylindrical midregion. See 

 lunate. 



CROWN CELLS: the cells 

 formed at the tips of the 

 investing elements that 

 are spirally twisted about 

 the egg in the Characeae. 



Crucigenia 56; also 49 

 irregularis 49 

 rectangularis 56 

 tetrapedia 56 



Cryptomonas 1 50 

 erosa 1 50 



Cryptophyceae 5, 7 



Cryptophyta 8, 1 1 



Ctenocladus 1 1 8 

 circinnatus 1 1 8 



CUP-SHAPED: a more or 

 less complete plate (as a 

 chloroplast) which lies just 



201 



