Plant Diversity - Quillworts - Google Sites
Leaf cushions are rhomboidal with ligule pits and oval–oblanceolate leaf scars. Leaf cushions or bases bearing a ridge are helically arranged in parastichies on wide axes. Smooth...
Lepidodendron - Virtual Museum of Geology
An extinct genus of a vascular, tree-like plant related to today's quillworts. Often called a "scale tree" due to diamond-shaped scars on the trunk; each scar representing the base of a leaf that was shed as the plant grew.
Isoetes - Wikipedia
The quillworts are spore-producing plants and highly reliant on water dispersion. Quillworts have different ways to spread their spores based on the environment. Quillwort leaves are hollow and quill-like, with a minute ligule at the base of the upper surface.
Lepidodendron - Wikipedia
Leaf scars shown on a Lepidodendron. The "diamond shape" or scale impressions are common indicators of the leaf scars from Lepidodendron lycophytes. The stem of the lycopsids had a unifacial vascular cambium, contrasting with the bifacial vascular cambium of modern trees.
Plant Evolution & Paleobotany - Lepidodendrids - Google Sites
This created large amounts of plant debris on the swamp floor, which piled up and was compressed over many, many years. This large amount of biomass became the coal that we use as fossil fuels...
Lepidodendrales - Wikipedia
The actual leaf scar is present slightly above the midpoint of the cushion and is roughly elliptical in shape. On the leaf scar, three small pitted impressions can sometimes be found. The central and always present pit results from a vascular bundle that extended into the leaf from the stem, known as “parichnos,” a system of aerating tissues.
Leaf cushions of Lepidodendraceae after leaf fall. A, B, …
Narrow-fusiform leaf cushions display a leaf scar, vascular bundle and ligule pit. Cylindrical megasporangiate strobili are borne singly, in pairs, or occasionally once-dichotomized. Of each...
Lepidodendron - WikiMili, The Best Wikipedia Reader
Leaf scars shown on a Lepidodendron. The "diamond shape" or scale impressions are common indicators of the leaf scars from Lepidodendron lycophytes. The stem of the lycopsids had a unifacial vascular cambium, contrasting with the bifacial vascular cambium of modern trees.
Here we will study two composite genera, organisms understood by piecing together information from form genera assumed to derive from the same plant: . Sigillaria: crown branched once or a few times, leaf scars in vertical rows. We will spend almost all of our time with Lepidodendron.
The Carboniferous Gondwanan lycophyte Bumbudendron , revisited
2024年10月19日 · The false leaf scar is present when the leaves had dried and collapsed, and the specimens show a slit corresponding to the leaf blade entering the matrix (Thomas and Meyen, 1984). The false leaf scar cannot be seen if the leaf scar is …