Bessey’s Classification system

Charles E. Bessey (1845-1915) proposed a modified system of classification of Bentham and Hooker. He separated the gymnosperms from angiosperms. He reorganized the orders of angiosperms. His system is popularly known as Besseyan system. It ssas published under the title The phylogenetic Taxonomy of Flowering plants.Bessey’s system was based on primitiveness and evolutionary advancement of plant groups. According him Ranales was a basic group. Monocots and most of the dicot groups evolved form it.

Classification System of Oswald Tippo

Oswald Tippo published outline of classification of plants in 1942. This classification was clerk ed from classification of Gilbert Smith. This system is popularly used by American writers. The scheme of classification of Tippo is:

A. Subkingdom Thallophyta

These plants do not form embryo. It is further divided into tbllov‘ ing phylums.

I. Cyanophyta (blue green algae)

  1. Euglenophyta (Flagellates like Euglena)

  2. Chlorophyta (Green algae)

  3. Chrysophyta (Diatoms

  4. Phaeophyta (Brown algae)

  5. Rhodophyta (Red algae)

  6. Pyrrophyta ( Dinotlagel lates)

  1. Schizomycophyta

  1. Myxomycophyta



  1. lomycophyta

B. Subkingdom Embryoph ta

‘these are embryo forming plants They are further divided into 1011(m ing phylums.

I. Bryophyta: These are non-vascular plants Examples: Mosses, liverworts and hornworts.

2. Tracheophyta: They are vascular plants. They are thrther divided into following subphylum:

  1.        Subphylum Psilopsitla: ‘these are leafless and rootless plants. Example: Psi lotuni

  2. Subphylum Lycopsitla: These are commonly called club, mosses. They have simple vascular tissue. Their leaves are small. Example: Selaginella

  3. Subphylum Sphenopsida: They are commonly called horsetail. They haNe jointed stem and reduced scale likeleaves. Example: Equisettim.

    1. Give importance of classification.
    2. Discuss history of classification.tissues.
    3. They have large leaves. They have all other advanced characteristics. This subphylum is further subdivided into three classes, These classes are:
    1. Class Filicineae (ferns)

    2. Gymnospermae (conifers)

    3. Angiospermae (flowering plants)

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