Classes of Fossil Gymnosperms

                                    Classes of Fossil Gymnosperms 

The two main causes of fossil gymnosperms will be discussed in the following paragraphs. Cycadopsida and Coniferopsida are the two classes.

Fossil Gymnosperms: Class #1: Pteridospermales (Cycadofilicales) of the Order Cycadopsida:

The upper Devonian is when the Ptieridospermae, also known as the Cycadofilicales, first emerged as petrified plants. They were widespread in the Carboniferous and reached Permian strata. They started to diminish after the Permian and eventually vanished completely.

Members of a very basic form of terrestrial plants vanished in the early Devonian rocks. These were most likely the most basic pteridophytes.

Some of them had little outgrowths that resembled leaves, some had no roots at all, and some had neither. Pteridophytes were not the same as this ancestor of land plants. The xylem and phloem tissue on their stem was well-formed, and sporangia were present on the tips of the branches.

We find several fossilized plants that belong to the Bryophytes, Pteridophytes, and Gymnosperm taxa from the Upper Devonian through the Carboniferous and, to some extent, into Permian layers.

There is an abundance of plant remnants in the Carboniferous strata. It seems that during ancient times, opulent, vast forests covered the entire surface of the planet. It appears that there was a rather consistent climate throughout the entire planet during those eras.

The fact that similar fossils have been discovered in extremely dispersed locations supports this theory. It seems that the earth's terrain underwent widespread and abrupt alterations during the Carboniferous, often known as the coal age.

It seems that extremely large woods were submerged, and it is from these submerged forests that we currently obtain our fossil fuel source. Huge equisetales and lycopods were prevalent during the Carboniferous, which has been referred to as the age of ferns.

In addition to these extinct pteridophytes, there were additional plants with seeds that produced Cycadian-type seeds. Formerly, plants that produced seeds were referred to as Cycadofilicales. American workers refer to them as Cycadofilicales, but English workers (Oliver and Scott) called them Pteridosperms.

Although earlier researchers were aware of these seeds, it wasn't until 1903 that they were connected to leaves that resembled ferns. Some of these Carboniferous seeds were discovered in organic continuity with the leaves of fern-like plants during this year. These fossilized seeds have a clear relationship to gymnosperms, which American laborers believe to be an extinct group.

They have distinct connections with cycads and ferns on opposite sides.

Because their seeds were not encased in closed carpels like those of angiosperms, these plants were clearly spermous. During the Carboniferous period, this group of seeded plants was dominating; they most likely started in the Upper Devonian and started to decline in the Permian, when they eventually vanished completely.

They were widely dispersed. They have been discovered everywhere that they have been looked for, including all of the countries in the Northern and Southern Hemispheres.

They were widely distributed. They have been discovered everywhere that they have been looked for, including all of the countries in the Northern and Southern Hemispheres.

Of all the Carboniferous plants, Lyginopteris is one of the most well-known. Before 1903, the stems, roots, leaves, and seeds of plants were all known to exist. Capitate glands were present on the entire surface of seeds, and it was because of these glands that the concept that various plant components may be sections of the same plant originated.

Subsequently, the roots, stems, and leaves of the complete plant were discovered in one location in an organic continuity.

There have occasionally been descriptions of several stem genera. These stem genera can be categorized into several families.

Lyginopteridaceae, Medullosaceae, Calamopityaceae, Peltaspermaceae, and Corystospermaceae are the more significant families.

For these plants, Pant (1957) creates a separate class Pteridospermopsida. He gave six orders for this.

lerave a reply