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 (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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Botany lecture notes

Similarities and Differences between Pteridophytes and Gymnosperms


Gymnosperm vs Pteridophytes

Pteridophytes vs Gymnosperms
(Similarities and Differences between Pteridophytes and Gymnosperms)

Pteridophytes:

Pteridophytes are a group of primitive land plants belongs to Cryptogams. They are the first plant group with vascular tissue for the conduction of water and food materials and hence they are called as Vascular Cryptogams.

Gymnosperms:

Gymnosperms are a group of primitive seed-producing plants of Spermatophytes (Phanerogams). They are ‘Naked-Seed’ Plants characterized by naked ovules (i.e., ovule without the ovary). The ovules of Gymnosperms are borne directly on the surface of the megasporophyl. Since ovary is absent, Gymnosperms do not produce fruits.

Pteridophytes occupy the intermediate position between Bryophytes and Gymnosperms (seed plants). Gymnosperms were believed to be originated from the Pteridophytes in the Devonian period (419 to 359 million years ago) of Paleozoic Era. Pteridophytes and Gymnosperms share many characteristics. In the previous posts, we discussed the General Characters of Bryophytes Pteridophytes and Gymnosperms. In this post, we will discuss the Similarities and Differences between Pteridophytes and Gymnosperms with Comparison Table.

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Botany lecture notes

Classification of Gymnosperms PPT (Chamberlain System – 1934)


Plant Science PPT

Classification of Gymnosperms PPT
(Chamberlain System of Classification of Gymnosperms – 1934)

Classification of Gymnosperms, Outline of the history of Classification of Gymnosperms, Chamberlain System of Classification of Gymnosperms, Class Cycadophyt and Coniferophyt, Order Cycadofilicales (Pteridospermales) Cycdeoidales (Bennettitles) and Cycdales, Order Cordaitales, Ginkgoales, Coniferales and Gnetales.

Learn more: Lecture Note on Classification of Gymnosperms

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