How to use true fern in a sentence? Find typical usage patterns (collocations)/phrases/context for "true fern" and check conjugation/comparative form for "true fern". Mastering all the usages of "true fern" from sentence examples published by news publications.
Neuropteris was a contemporary fern-like plant. The true fern Pecopteris also grew in West Virginia during the Pennsylvanian. Amphibians also inhabited in these swamps. Between 270 and 255 million years ago, during the Permian period, the Appalachian Mountains began to form.
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A "fertile frond" of a true fern is not really a flower at all. In fact, ferns are not flowering plants. However some experts think that the flowering fern myth has roots in reality. In the past, the grouping of plants was not as exact as modern taxonomic ones.
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Psilotum complanatum, the flatfork fern, is a rare herbaceous epiphytic fern ally in the genus Psilotum. There is some evidence that it might be a true fern that has lost some typically fern-like characteristics. Morphologically, the plant is simple, lacking leaves and roots, and having hanging stems with dichotomous branching, which lack developed leaves but have minute scales. The stems and branches have protostele, with a triangular-shaped core of xylem.
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Parablechnum wattsii shows the typical life stages of a fern with distinct sporophyte and gametophyte stages. A distinctive feature of the Blechnaceae is the presence of separate fertile and sterile, photosynthetic fronds. The fertile frond produces numerous spores which are prolific and easily collected and propagated to mature plants. It takes around 4–6 weeks for the prothallus to form, and another 6–12 months for the first true fern frond to develop.
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Selaginella willdenowii is a species of vascular plant in the Selaginellaceae family. It is a spikemoss known by the common names Willdenow's spikemossSelaginella willdenovii -- Willdenow's Spikemoss, Encyclopedia of LifeSelaginella willdenowii, USDA Plants Database and peacock fernNature's Palette - the Science of Plant Color by David Lee due to its iridescent blue leaves.Function of blue iridescence in tropical understorey plants by Thomas et al; 25 October 2010Leaves change colors under different lighting: Selaginella ferns, asknature.org Like other Selaginallales, it is fern ally and not a true fern.
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The prothallus harbours sporadic marginal archegonial cushions and this is where the archegonia are borne, while the antheridia are borne on slender branches on the basal margins of the prothallus. In the presence of water, spores germinate following a typical fern progression, with the antheridia trapped under the prothallus bursting to release the sperm cells. A chemical signal (sperm chemotaxis) is released from the archegonia which attracts the motile sperm cells towards it. Once the sperm cells reach the archegonium, they open and enable the male gamete to travel down to the ovum, with which it unites to induce fertilisation and form a zygote. This fertilised zygote is diploid and develops into an embryo and sporophyte, or ‘true fern’ that is most readily recognised, while remaining embedded in the prothallus.
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