Sigillaria


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Related to Sigillaria: Lepidodendron, Cordaites

Sigillaria

(sĭjĭlâr`ēə), genus of fossil club moss allied to LepidodendronLepidodendron and Sigillaria
, two principal genera of an extinct group of primitive vascular trees. They dominated the forests of the early Carboniferous period until the ferns gained ascendancy.
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, abundant in the Carboniferous period. The thick trunk was rarely branched and was covered for several feet from the top with erect leaves that were larger than those of Lepidodendron; the leaf scars were in vertical rows. The fossilized root stocks of Sigillaria, as of Lepidodendron, are known as stigmaria. Club mosses are classified in the division LycopodiophytaLycopodiophyta
, division of the plant kingdom consisting of the organisms commonly called club mosses and quillworts. As in other vascular plants, the sporophyte, or spore-producing phase, is the conspicuous generation, and the gametophyte, or gamete-producing phase, is minute.
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References in periodicals archive ?
Observations sur la structure interieure du Sigillaria elegans comparee a celle des Lepidodendron et des Stigmaria et a celle des vegetaux vivants.
I was amazed at the grand succession of stratified beds exposed as plainly as in a pictured section, and was interested beyond measure in the beds of coal, with all their accompaniments, exposed in the cliffs and along the beach, the erect trees (Sigillaria) represented by sandstone casts, and the numerous fossil plants displayed in the beds.
In another example, it is postulated that the fossil Chaloneria (Isoetales) evolved from its putative ancestor Sigillaria (Lepidodendrales) by neoteny and progenesis (Bateman, 1994).
floccosa Salpiglossis sinuata CH Corolla Reduced size flowers, CL flowers Sigillaria, Time of reporduction Earlier Chaloneria (both fossils) Veroniocastrum virginicum, Sepals Increased size Veronica chamaedrys Viola odorata CH flowers, Maturation time Earlier CL flowers Viola odorata CH flowers, Whole flower Reduced size CL flowers Vegetative traits Cucurbita argyrosperma Leaf Reduced lobing sororia, C.
From these charred specimens of Calamites, Sigillaria, and others, he then began to catalogue the nature of individual cells, and used these observations to aid identification of dispersed cells, more commonly encountered in the coals (Dawson 1865).
One of the first plants he attempted to reconstruct was the lycopsid Sigillaria. For several years, it had been known that Stigmaria found in the underclay of coals was in fact the rhizophore of Sigillaria (Logan 1841; Brown 1846), and to this evidence Dawson was able to add many other convincing proofs (Fig.
But beyond this, Dawson's reconstruction of Sigillaria was based on poorly founded supposition, and this must represent the weakest facet of Dawson's otherwise careful and cautious paleobotanical work.
Lycopsid remains are very rare indeed, represented only by leaf compressions (Cyperites sp.) at 220 m in the measured section, and at 241 m, by trunk compressions (Lepidodendron sensu latu and Sigillaria cf.
This assemblage represents fire in lowland peat-forming communities dominated by Sigillaria and medullosan pteridosperms.