Botany lecture notes

Economic Importance of Gymnosperms (Short Notes)


economic importance of gymnosperms

Economic Importance of Gymnosperms

The Gymnosperms are with high economic importance to mankind. For easy understanding, the economic importance of Gymnosperms can be categorized in the following heads:

(1).      Food Value

(2).      Medicinal Value

(3).      Timber Value

(4).      Source of Oil

(5).      Industrial Value

(6).      Ornamental Value

(7).      Other Uses

gymnosperms economic aspects

(1). Food Value

Ø  Cycads are a good source of Starch.

Ø  ‘Sago’ is a starch obtained from the pith and cortex of the stem of Cycas revolute and Cycas rumphi.

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what is Caytonanthus

Caytoniales General Characteristics


what is caytoniales

Caytoniales
(General Characteristics of Caytoniales)

What are Caytoniales?

Ø  Caytoniales were a small group of extinct Gymnospermic plants.

Ø  First described by Hamshaw Thomas in 1925 from the late Triassic period.

Ø  Caytonia is a berry-like cupules with numerous small seeds.

Examples of Caytoniales

Ø  Leaves: Sagenopteris

Ø  Microsporophylls: Caytonanthus

Ø  Megasporophylls: Caytonia and Gristhorpia

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characteristics of glossopteridales

Glossopteridales-General Characteristics (Glossopteris Short Notes)


What is Glossopteris

Glossopteridales General Characteristics
Characteristics of Glossopteridales: Fossil Gymnosperm

Glossopteridales

Ø  Glossopteridales included an extinct group of seed plants (Gymnosperms).

Ø  They were originated during the Permian period on the Gondwana Continent.

Ø  They became the dominant vegetation in the Permian period.

characteristics of glossopteridales

Ø  They extinct completely by the end of the Triassic period.

Ø  The order name derived from the genus Glossopteris

Ø  Glossopteris is the best-known member of Glossopteridales

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Botany lecture notes

Pteridospermales PPT (General Characteristics, Classification and Affinities)


Plant Science PPT

Pteridospermales (Cycadofilicales) PPT
(Characteristics, Classification and Affinities of Pteridospermales)

What are Pteridospermales or Cycadofilicales? Geological Horizon / Origin of Pteridospermales, Who Discovered Pteridospermales? What are the Characteristics of Pteridospermales, Morphology of Pteridospermales, Anatomy of Pteridospermales, Reproduction of Pteridospermales, Classification of Pteridospermales, Affinities of Pteridospermales, Examples of Pteridospermales, Similarities between Pteridospermales and Pteridophytes (Ferns), Similarities between Pteridospermales and Cycadales.

Learn more: Lecture Note on Pteridospermales Characteristis

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Botany lecture notes

Pteridospermales (Cycadofilicales)- General Characters, Classification and Affinities


Pteridospermales Characteristis

Pteridospermales (Cycadofilicales)
General Characteristics, Classification and Affinities of Cycadofilicales

What are Pteridospermales?

Ø  Pteridospermales are a group of Fossil Gymnosperms.

Ø  They are also called as Cycadofilicales (Chamberlain used the term).

Ø  As the name suggests, they are the ‘Seed Ferns’.

Ø  They are Gymnosperms with ‘Fern-like’ leaves which produce ‘Seeds’.

Cycadofilicales Seed Fern

The Reconstruction of a Pteridospermales Member. Note the Erect Stem, Fern Like Leaves, Circinate Venation and Vein Pattern

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