Classic species of Sigillaria pre dinosaur fossil plant arborescent clubmoss for Sale

Classic species of Sigillaria pre dinosaur fossil plant arborescent clubmoss For Sale

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Classic species of Sigillaria pre dinosaur fossil plant arborescent clubmoss :
$28.00

Specimen:Classic fossil plantSigillaria deutschiana Brongniart 1828 -classic fossilspecies!

Locality: Poland,GZWUpper Silesia Coal Basin

Stratigraphy: Upper Carboniferous - Westphalian B -Orzeskie Beds

Age:ca 305 Mya

Matrixdimensions: ca 10,0 x 8,0 x 4,5 cm

Description:

Big specimen of very rareSigillaria species - Sigillaria deutschiana Brongniart 1828.

Sigillaria is a genus ofextinct, spore-bearing, arborescent (tree-like) plants which flourished in theLate Carboniferous period but dwindled to extinction in the early Permianperiod. It was a lycopodiophyte, and is related to the lycopsids, orclub-mosses, but even more closely to quillworts, as was its associateLepidodendron. Sigillaria was a tree-like plant, with a tall, occasionallyforked trunk that lacked wood. Support came from a layer of closely packed leafbases just below the surface of the trunk, while the center was filled withpith. The old leaf bases expanded as the trunk grew in width, and left adiamond-shaped pattern, which is evident in fossils. The trunk hadphotosynthetic tissue on the surface, meaning that it was probably green. Thetrunk was topped with a plume of long, grass-like, microphyllous leaves, sothat the plant looked somewhat like a tall, forked bottlebrush. The plant boreits spores (not seeds) in cone-like structures attached to the stem.Sigillaria, like many ancient lycopods, had a relatively short life cycle -growing rapidly and reaching maturity in a few years.

Some have suggestedthat Sigillaria was monocarpic, meaning that it died after reproduction, thoughthis is not proven. It was associated with Lepidodendron, the scale tree, inthe Carboniferous coal swamps. The clubmoss trees of the genus Sigillariaformed an important part of the coal swamps in the Late Carboniferous. Theycould reach a height up to 30 ms and bore grasslike leaves in the upper part ofthe unbranched or once divided trunk. The leaves were attached directly to thestem and they left scars when they were shed. Characteristic of the genus of Sigillariais the fact that the leaf scars were arranged in vertical rows. On the groundof these leaf scars many species have been described. The trunk was somewhatthickened at the base.The spore-cones were attached in or under the crowndirectly to the stem. They are called Sigillariostrobus.The undergroundparts of the tree can hardly be distinguished from those of Lepidodendronand they are called Stigmaria. From the Westfalian D on the number ofspecies of Sigillaria diminished strongly.

Systematic:

Division:Tracheophyta (Lycoposida)

Class: Lycopodinae

Order: Lycophodiales

Family: Subsigillariaceae

Genus: Subsigillaria

Species: Sigillaria deutschianaBrongniart 1828