HOW TO KNOW THE FRESH-WATER ALGAE 



FAA (Preservative) 16 

 FALSE BRANCH: a branch 

 formed by lateral growth 

 of one or both ends of a 

 broken filament; a branch 

 not formed by lateral di- 

 vision of cells in an un- 

 broken filament. 

 FALSE FILAMENT: an ar- 

 rangement of cells to form 

 a short or loose thread; 

 not forming a definite 

 linear series of cells. 

 Family (defined), 3 

 FIBRIL: a fine thread. 

 FILAMENT: a thread of 

 cells; one or more rows 

 of cells; in the blue- 

 green algae the thread 

 of cells together with a 

 sheath that may or may 

 not be present, the thread 

 of cells referred to as a 

 trichome, which see. 

 FISSION: cell division by 

 constriction not involving 

 nuclear division (mitosis). 

 FLAGELLAR VACUOLES: ca- 

 vities in the cytoplasm at 

 the anterior end of a 

 motile cell, at the base 

 of the flagella, which see. 

 FLAGELLUM: a relatively 

 coarse, whip-like organ of 

 locomotion, arising from 

 a special granule, the ble- 

 pharoplast, within a cell. 

 FLANGE: a longitudinal 

 bulge or wing-like vertical 

 extension from the sur- 

 face of an organism or 

 cell. 

 FLASK-LIKE: broad at the 

 base and abruptly nar- 

 rowed to a neck-like ex- 

 tension. 

 FLORIDEAN STARCH: a food 

 reserve produced within 

 the red algae (Rhodophy- 

 ta) different from the 

 starches formed by other 

 plants. 

 FOLIOSE: leaf-like; a flat 

 or curled, expanded thal- 

 lus. 

 Formalin (preservative), 16 

 Fragilaria 187; also 186 

 Franceia 56, 79, 84 



Droescheri 56 

 Fridaea 121 



torrenticola 121 

 FUCOXANTHIN: a brown 

 pigment predominant in 

 the Phaeophyta. 

 FUSIFORM: a figure broad- 

 est in the midregion and 

 gradually tapering to both 

 poles which may be acute 

 or bluntly rounded; 

 shaped like a spindle. Fig. 

 349 



Figure 349 



GAMETANGIUM: any cell, 

 specialized or unspecial- 

 ized, which produces ga- 

 metes (mqle or female 

 sex cells). 

 GAMETE: a sex cell; cells 

 which unite to produce a 

 fertilized egg or zygo- 

 spore, which see. 

 Gemine//o 106, 107 

 interrupta 1 06 

 mutabilis 1 06 

 Genicularia 72, 94; also 73 



elegans 72 

 GENICULATE; GENICULA- 

 TION: bent, as a knee- 

 joint; bending or abrupt- 

 ly curved. 

 Genus, defined, 3 

 GIRDLE VIEW: see Valve. 

 Glaucocystis 129, 178 

 duplex 1 29 

 Nostochinearum 1 29 

 Glenodinium 1 53 

 Kulczynski 1 53 

 Gloeobotrys 143 



limneticus 1 43 

 Gloeocapsa 1 80 

 punctata 1 80 

 Gloeochaete 128, 178; also 

 129 



Wittrockiana 128 

 Gloeochloris 1 42 



Smithiana, synonym of 

 Chlorosaccus fluidus, 1 42 

 Gloeocystis 41, 46, 48, 82, 

 129; also 40, 99 

 ampla 41 

 gigas 4 1 

 major 4 1 

 Gloeotaenium 61, 85 



Loitelsbergerianum 61 

 Gloeothece 185 



linearis 185 

 Gloeotrichia 166; also 167 

 echinulata 1 66 

 natans 166 

 Pisum 1 66 

 Glycerin, in preservative, 16, 



17; in mounts, 22, 150 

 Glycerin Jelly, for mounts, 



16, 17 

 GLYCOGEN: a starch-like 

 storage product question- 

 ably identified in food 

 granules of the Cyano- 

 phyta. 

 Golenkinia 61, 79 

 paucispina 6 1 

 radiata 6 1 

 Gomontia 116; also 117 



Holdenii 1 1 6 

 Gomphonema 188 -* 

 Gomphosphaeria 179, 184 

 aponina 1 79 

 lacustris 1 79 

 Gonatozygon 73 

 aculeatum 73 

 Gonatozygonaceae 72, 73 

 Gongrosira 117, 119; also 

 118 



Debaryana 1 1 7 

 Goniochloris 1 42 



scu/pta 1 42 

 Gonium 26 

 pectorale 26 



Gonyaulax 1 52 

 palustre 1 52 



Gonyostomum 23; also 8 

 semen 23 



GREGARIOUS: an associa- 

 tion; groupings of indi- 

 viduals not necessarily 

 joined together but close- 

 ly assembled. 



GULLET: a canal leading 

 from the opening of fla- 

 gellated cells into the 

 reservoir in the anterior 

 end. (See Euglena, Fig 8.) 



Gymnodinium 151 

 fuscum 1 5 1 

 palustre 151 



Gymnozyga 90; also 88 

 moniliformis 90 



GYPSUM: granules of cal- 

 cium sulphate which occur 

 in the vacuoles of some 

 desmids. (See Closterium, 

 Fig. 86.) 



H 



HAEMATOCHROME: a red 

 or orange pigment, espe- 

 cially in some Chloro- 

 phyta and Euglenophyta, 

 which masks the green 

 chlorophyll. 



Haematococcus 30, 130; al- 

 so 22, 33 

 lacustris 30 



Hapalosiphon 1 69 

 hibernicus 1 69 



HARD WATER: abundantly 

 supplied with dissolved 

 minerals; with a pH above 

 neutral (7.0). 



Herr.idinium 1 53 

 nasutum 1 53 



Herbarium Specimens 16 



HETEROCYST: an enlarged 

 cell in some of the fila- 

 mentous blue-green algae, 

 usually empty and differ- 

 ent iln shape from the 

 vegetative cells. Fig. 350 



Figure 350 



HETEROGAMETE: a gamete 

 (sex cell) clearly differ- 

 entiated in respect to 

 maleness or femaleness 

 (antherozoid and egg). 



Heterokontae 1 26 



HOLD-FAST CELL: a basal 

 cell of a filament or 

 thallus differentiated to 

 form an attaching organ. 



Holopedium 1 8 1 

 irregulare 1 8 1 



HORIZONTAL GROWTH: 

 growth more or less at 

 right angles to outward- 

 ly or upwardly projecting 

 filaments or parts; usual- 

 ly growth parallel with a 

 substrate to which a plant 

 is attached. 



203 



