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Cells elongate (35-1000 μm long) and
taperingtowardstheends.Theoutlinemay
be bow-shaped, sickle-shaped or more or
less straight. Cells are divided into two
halves (without a median constriction)
and contain two chloroplasts - each lying
either side of the central area, with several
prominent pyrenoids along each chloro-
plast. Cell walls may be smooth or have
longitudinal striae. Widespread in waters
ranging from acidic nutrient-poor to alka-
line nutrient-rich, occurring in plankton
or in amongst moss plants. Chlorophyta.
Plate XXX. Fig. 4.80.
Asteromphalus
128
Audouinella
11
Aulacodiscus
135
Aulacoseira
27
Auliscus
135
Batrachospermum
11
Botryococcus
86
Brachysira
198
Bulbochaete
15
Caloneis
194
Calothrix
48
Campylodiscus
151
Carteria
116
Centronella
147
Ceratium
123
Chaetoceros
143
Chaetopeltis
95
Chaetophora
16
Chamaesiphon
57
4.3 List of algae included and their
occurrence in the key
Chara
2
Chlamydomonas
122
Chlorella
209
Chlorogonium
117
The number at which particular genera key out is
given below. Where a particular species of a genus
would key out differently to the main genus these are
listed by species in addition to the genus.
Chodatella
208
Chromulina
113
Chroococcus
65
Chroomonas
120
Chrysochomulina
113
Cladophora
23
Closterium
223
Genus or species
Key number
Cocconeis
152
Coelastrum
98
Acanthoceros
143
Coelosphaerium
61
Achnanthes
175
Coleochaete
12
Achnanthidium
175
Coscinodiscus
138
Actinastrum
81
Cosmarium
216
Actinocyclus
138
Craticula
199
Actinoptychus
129
Crucigenia
105
Actinotaenium
214
Cryptomonas
120
Anabaena
52
Cyclotella
137
Amphipleura
202
Cylindrospermum
50
Amphora
162
Cymatopleura
154
Ankistrodesmus
222
Cymbella
164
Ankyra
221
Desmidium
33
Apatococcus
105
Desmococcus
105
Aphanizomenon
51
Diadesmis
189
Aphanocapsa
67
Diatoma
29
and
146
Aphanochaete
15
Diatoma mesodon
184
Aphanothece
66
Diatoma hyemalis
185
Arthrospira
53
Dictyosphaerium
85
Asterionella
78
Didymosphenia
169
Asterococcus
89
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