Changes

Jump to navigation Jump to search
660 bytes added ,  8 years ago
no edit summary
Line 83: Line 83:     
Many fossil diatoms are known, because the siliceous skeleton of the wall (Figure 26.6) is practically indestructible, and as diatoms are one of the major groups of algae in the Oceans, large fossil deposits of diatom walls have accumulated in many areas. These deposits, known as ''diatomaceous Earth'', have industrial uses as abrasives and filtering agents.
 
Many fossil diatoms are known, because the siliceous skeleton of the wall (Figure 26.6) is practically indestructible, and as diatoms are one of the major groups of algae in the Oceans, large fossil deposits of diatom walls have accumulated in many areas. These deposits, known as ''diatomaceous Earth'', have industrial uses as abrasives and filtering agents.
 +
 +
== The Major Groups of Algae ==
 +
 +
 +
'''The Group Names''' are - Green algae: division Chlorophyta; Euglenids: division Euglenophyta; Dinoflagellates and related forms: division Pyrrophyta; Chrysophytes and diatoms: division Chrysophyta; Brown algae: division Phaeophyta; and Red algae: division Rhodophyta.
 +
 +
The main distinctions are based upon the inclusion or not of three types of chlorophylls, special carotenoids and phycobilins; composition of the cellulosic Cell wall (nay, yay and double - and with or without algin); and the Nature of reserve materials (be they starch, paramylum and fats, starch and oils, leucosin and oils, or laminarin and fats);
 +
    
== The Natural Distribution of Algae ==
 
== The Natural Distribution of Algae ==
209

edits

Navigation menu