The document discusses different types of algae. It describes their key characteristics including habitat, pigmentation, food storage mechanisms, cell structure, and reproductive strategies. Some of the major algal divisions covered include Chlorophyceae, Xanthophyceae, Phaeophyceae, Rhodophyceae, Bacillariophyceae, and Myxophyceae. Characteristics like color, cell components, habitat, and food storage compounds are used to differentiate between divisions of algae.

1. Algae

2.  International code of botanical nomenclature
certain suffixes
 phyta-division
 phyceae-class
 phycideae-subclass
 ales-order
 inales-suborder
 aceae-family
 oideae-subfamily
 Greekname fr genus
 Latin name fr sps

3.  Pigment constituents of the cell
 Chemical nature of stored food materials
 Kind,number,point of insertion and relative
length of flagella
 Chemical composition of cell wall
 Presence or absence in the nucleus of the cell

4.  Myxophyceae
 Chlorophyceae
 Xanthophyceae
 Chrysophyceae
 Bacillariophyceae
 Cryptophyceae
 Dinophyceae
 Chloromonidineae
 Euglenineae
 Phaeophyceae
 Rhodophyceae

5.  Fresh water forms
 Simple thallus
 Bluish green in color
 Cells lack nucleus
 Photo synthetic products are polysaccharide
and glycogen
 Sexual reproduction is absent
 Motile cells are not produced

6. Chlorophyacae (green algae)
Mostly fresh but few marine
Green colour
Presence of chlorophyy a and b
Xanthophylls an d caretonoids
Reserved food material is starch

7. Xanthophyceae
Yellow green colour due to excess
of xanthophylls
Fresh water,few marine
Pyrenoids are absent in
chromatophore
Oil is reserved food material

8.  Marine and fresh water
 Thallus is brown or orange
 Ancessory pigment phycocrysin
 Reserved food material is oil and leucosin

9.  Fresh water and marine
 Diverse colour(brown,red,olive green,bluish
green)
 Starch is reserved food material

10.  Unicellular and motile
 Biflagellate and sculptured cell wall
 Resered fod material is starch and fat

11.  Bright green in colour
 Excess of xanthophylls
 Numerous discoid chromatophores
 Reserved food material is fat

12.  Unicellular an d motile
 One or two flagella
 Fresh wate or saline habitats

13.  Mostly marine
 Brown colour
 Complicated and organised thalli
 Common name sea weeds
 Reserved food material is alcohol and
polysacchrides

14.  Marine and fresh water
 Colour red or dark red
 Accesory pigmentsc-phycocyanin and r-
phycoerythin
 Reserved food material is floridean starch.

15.  Known as diatoms
 Fresh water and marine
 Diatomin as principle pigment
 Yellow or golden brown in color
 Cell wall partly silicified and partly pectose