Classification of algae

1. FRITSCH –1935
11 classes, based on
Nature of pigments
Reserve food material
Mode of Reproduction
CLASSIFICATION

2.  Fresh water and marine forms
 Chief pigments – chlorophyll
 Reserve food – starch
 Unicellular motile to heterotrichous forms
 Reproduction – asexual and sexual
1. CHLOROPHYCEAE

3.  Fresh water and marine
 Yellow pigment –Xanthophyll
 Unicellular to filamentous
 Reserve food – oil
 Reproduction –Sexual and asexual
2. XANTHOPHYCEAE
(YELLOWGREEN ALGAE)

4.  Fresh water forms
 Brown or orange coloured pigment
 Oil and leucosin
 Motile to filamentous
 Reproduction - isogamous
3.CHRYSOPHYCEAE

5.  Fresh water,soil
 Chromatophores are yellow green
 Reserve food- fat and volutin
 Unicellular or colonial
 Cell wall composed of silica
 Special type of reproduction
4. BACILLARIOPHYCEAE

6.  Fresh water and marine
 Diverse pigmentation
 Presence of motile cells
5.CRYPTOPHYCEAE

7.  Sea water planktons
 Starch and oil
 Chromatophores dark yellow
 Unicellular motile to branched filaments
 Reproduction isogamous
6. Dinophyceae

8.  Fresh water
 Bright green coloured
 Oil
 motile
7. CHLOROMONADINIAE

9.  Fresh water
 Pure green chromatophore
 Polysacharide and paramylon
 Motile
8.EUGLINEAE

10.  Mrine
 Pigments – carotenoids- fucoxanthin
 Mannitol and laminarin
 Filamentous to parenchymatous
 Isogamous to oogamous
9. PHAEOPHYCEAE

11.  Fresh water and marine
 Phycoerythrin and phycocyanin
 Floridean starch
 Simple filamentous to complex forms
10 .RHODOPHYCEAE

12.  Marine and fresh water
 Prokaryotic
 Blue green
 Phycocyanin
 No sexual Reproduction
11. MYXOPHYCEAE

13.  Robert Edward Lee (1989) classified the algae
into 4 evolutionary groups, 15 divisions and
classes.
 Group 1. Prokaryotic algae:
 1. Division. Cyanophyta (blue green algae):
Chlorophyll a; phycobiliproteins.
 2. Division. Prochlorophyta (prochloro-
phytes): Chlorophyll a and b; no
phycobiliproteins.
Classification by Robert Edward Lee (1989):

14.  Group 2. Eukaryotic algae:
Eukaryotic algae with chloroplast surrounded
only by the two membranes of the chloroplast
envelope.
 1. Division. Glaucophyta: algae that repre­
sent
an intermediate position in the evolu­
tion of
chloroplast; photosynthesis is carried out by
modified endosymbiotic blue-green algae.
 2. Division. Rhodophyta (red algae): Chlorophyll
a and d; phycobiliproteins; no flagellated cells;
storage product is floridean starch.
 3. Division. Chlorophyta (green algae):
Chlorophyll a and b; storage product starch is
found inside the chloroplast.

15.  Group 3. Eukaryotic algae:
 Eukaryotic algae with chloroplast surrounded only
by one membrane of chloro­
plast endoplasmic
reticulum.
 1. Division. Euglenophyta (euglenoid): chloro­
phylls a
and b, one flagellum with a spiralled row of fibrillar
hairs; proteinaceous pellicle in strips under the
plasma membrane; storage product is paramylon;
characteristic type of cell division.
 2. Division. Dinophyta (dinoflagellates): meso­
karyotic nucleus; chlorophyll a and c1; cell commonly
divides into an epicone and a hypocone by a girdle;
helical transverse flagellum; thecal plates in vesicles
under the plasma membrane.

16.  Group 4. Eukaryotic algae:
 Eukaryotic algae with chloroplast surrounded
by two membranes of chloroplast endoplasmic
reticulum.
 1. Division. Cryptophyta (cryptophytes):
 2. Division. Crysophyta (golden-brown algae):
 3. Division. Prymnesiophyta (haptophytes):

17.  4. Division- Bacillariophyta (diatom.
 5. Division - Xanthophyta (yellow green algae
 6. Division- Eustigmatophyta: eye-spot large
and outside chloroplast; chlorophyll a;
posterior whiplash flagellum (commonly
reduced) and anterior tinsel flagellum.
 7. Division- Raphidophyta (chloromonads):
chlorophyll a and c; anterior tinsel flagellum
and posterior whiplash flagellum.
 8. Division- Phaeophyta (brown algae
fucoxanthin, storage product chrysolaminarin
is found in vesicles in cytoplasm.

18. THANKS