How To Use Gymnosperm In A Sentence
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This formation of germinal vesicles and prothallium seems very different from the formation of archegonia and prothallium in Selaginella, for instance; but the link which connects the two is in the gymnosperms, where distinct archegonia in a prothallium are formed.
Scientific American Supplement, No. 531, March 6, 1886
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The gymnosperms are characterized by large genomes and relatively low chromosome numbers; polyploidy is rare.
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Shady conditions at ground level favor woody climbers that include strangler figs (Ficus spp.) and the cablelike Gnetum, an unusual climbing gymnosperm.
Kayah-Karen montane rain forests
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Early gymnosperms and angiosperms were wind-pollinated.
False Fear? - The Panda's Thumb
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The famous relict gymnosperm Welwitschia mirabilis is also found throughout the ecoregion, and it is often the most conspicuous feature of the vegetation, scattered about the arid plains at intervals of 50 to 100 m.
Kaokoveld desert
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From that time onwards, so long as these Gymnosperms were, as was usual, reckoned as dicotyledonous flowering plants, the term Angiosperm was used antithetically by botanical writers, but with varying limitation, as a group-name for other dicotyledonous plants.
Encyclopaedia Britannica, 11th Edition, Volume 2, Part 1, Slice 1
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The relict gymnosperm Welwitschia mirabilis, which represents the sole surviving member of its family, is found throughout the ecoregion.
Kaokoveld desert
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The checklist is divided into the following categories: ferns, gymnosperms, dicots, and monocots.
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The development of the microsporangia and the contained spores (pollen-grains) is closely comparable with that of the microsporangia in Gymnosperms or heterosporous ferns.
Encyclopaedia Britannica, 11th Edition, Volume 2, Part 1, Slice 1
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Many paleobotanists believe that the earliest seed plants evolved from heterosporous Middle Devonian plants like the progymnosperms.
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The development of the ovule, which represents the macrosporangium, is very similar to the process in Gymnosperms; when mature it consists of one or two coats surrounding the central nucellus, except at the apex where an opening, the micropyle, is left.
Encyclopaedia Britannica, 11th Edition, Volume 2, Part 1, Slice 1
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Dominant species include the cold-tolerant, xerophytic shrub, Haloxylon ammodendron (Goosefoot Family Chenopodiaceae), the tamarisk (Reaumuria spp.), and the gymnosperm Ephedra przewalski.
Qaidam Basin semi-desert
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There are 794 angiosperm genera, 77% of China's total angiosperm species, 24 gymnosperm, 70 pteridophyte and 102 bryophyte genera.
The Sichuan Giant Panda Sanctuaries, China
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A characteristic feature of gymnosperms is polyembryony manifested in the formation of more than one embryo in immature seed.
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The only gymnosperm tree, Podocarpus (= Nageia) wallichianus, is also endemic.
Biological diversity in the Western Ghats and Sri Lanka
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Simple trichomes are present on aerial surfaces of most angiosperms and on some gymnosperms and bryophytes.
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Bass suggested that the fossils might represent fructifications of angiosperms or gymnosperms, or perhaps both, but said formal identifications had not been made.
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These, as in Gymnosperms, are of two kinds, microspores or pollen-grains, borne in the stamens (or microsporophylls) and megaspores, in which the egg-cell is developed, contained in the ovule, which is borne enclosed in the carpel (or megasporophyll).
Encyclopaedia Britannica, 11th Edition, Volume 2, Part 1, Slice 1
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The gymnosperms are characterized by large genomes and relatively low chromosome numbers; polyploidy is rare.
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New Caledonia has a remarkable diversity of gymnosperms (primitive nonflowering plants that include conifers), with forty-four species (forty-three of which are endemic) out of fifteen genera (at least three of which are endemic).
New Caledonia rain forests
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Among the plant branches, there were several supported groupings representing only gymnosperms or conifers.
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The development of the microsporangia and the contained spores (pollen-grains) is closely comparable with that of the microsporangia in Gymnosperms or heterosporous ferns.
Encyclopaedia Britannica, 11th Edition, Volume 2, Part 1, Slice 1
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The known flora consists of 41 ferns and fern allies, 3 gymnosperms, 291 monocots, and 516 dicots.
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Copia group sequences have been found in diverse species, including single-cell algae, bryophytes, gymnosperms, and angiosperms.
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The coal measures contain not only fern-like cryptogamic plants and phanerogamic monocotyledons (grasses, yucc-like Liliaceae and palms), but also gymnospermic dicotyledons (Coniferae and Cycadeae), amounting in all to nearly 400 species, as characteristic of the coal formations.
COSMOS: A Sketch of the Physical Description of the Universe, Vol. 1
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Gymnosperms, including conifers, gingkoes, and cycads, were very numerous, as were ferns and horsetails.
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Simple trichomes are present on aerial surfaces of most angiosperms and on some gymnosperms and bryophytes.
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Angiospermae by Paul Hermann in 1690, as the name of that one of his primary divisions of the plant kingdom, which included flowering plants possessing seeds enclosed in capsules, in contradistinction to his Gymnospermae, or flowering plants with achenial or schizo-carpic fruits -- the whole fruit or each of its pieces being here regarded as
Encyclopaedia Britannica, 11th Edition, Volume 2, Part 1, Slice 1
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Taxonomists can now say that the ferns' closest cousins are the seed plants - angiosperms (flowering plants) and gymnosperms (such as conifers).
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Outline of gymnospermous medicinal plants in China.
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Foliar galls probably caused by mites also have been recognized on one gymnosperm species in the formation.
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The known flora consists of 41 ferns and fern allies, 3 gymnosperms, 291 monocots, and 516 dicots.
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The gingko is a species of gymnosperm known as a “living fossil,” because it is the only living species in its group.
ACSI v. Stearns, aka Wendell Bird vs. UC - The Panda's Thumb
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Vegetation within the desert consists of a thin scrub of Anabasis brevifolia while the peripheral areas support a dwarf woodland dominated by saxaul bush (Haloxylon ammodendron) and the gymnosperm Ephedra przewalskii.
Junggar Basin semi-desert
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The advent in 1851 of Hofmeister's brilliant discovery of the changes proceeding in the embryo-sac of flowering plants, and his determination of the correct relationships of these with the Cryptogamia, fixed the true position of Gymnosperms as a class distinct from Dicotyledons, and the term Angiosperm then gradually came to be accepted as the suitable designation for the whole of the flowering plants other than
Encyclopaedia Britannica, 11th Edition, Volume 2, Part 1, Slice 1
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Endemism is particularly high in 33 angiosperm and six gymnosperm, and fern families, most of which are ancient or primitive with restricted relict distributions.
Queensland tropical rain forests
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The distribution of this relict gymnosperm extends from the Kuiseb River in Namibia to Namibe in southern Angola.
Namib desert
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Pollination in angiosperms and gymnosperms is the process that transfers pollen grains, which contain the male gametes (sperm) to where the female gamete (s) are contained within the carpel; [1] in gymnosperms the pollen is directly applied to the ovule itself.
Pollination
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These totals incorporate both terrestrial and aquatic angiosperms, together with gymnosperms, including the enigmatic gnetophyte Welwitschia mirabilis.
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In all the Archegoniate (including the majority of gymnosperms) fertilization and the first critical phases of embryogeny occur within the shelter provided by the archegonium and the adjacent gametophytic tissue.
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Another type of apomictic development has been reported to occur in the gymnosperm Cupressus dupreziana, where embryos develop from unreduced pollen grains.
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Although GVG-regulated gene expression has been characterized extensively in dicotyledonous and monocotyledonous plants such as tobacco, Arabidopsis, and rice, it has not been tested in gymnosperms.
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There are 794 angiosperm genera, 77% of China's total angiosperm species, 24 gymnosperm, 70 pteridophyte and 102 bryophyte genera.
The Sichuan Giant Panda Sanctuaries, China
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These, as in Gymnosperms, are of two kinds, microspores or pollen-grains, borne in the stamens (or microsporophylls) and megaspores, in which the egg-cell is developed, contained in the ovule, which is borne enclosed in the carpel (or megasporophyll).
Encyclopaedia Britannica, 11th Edition, Volume 2, Part 1, Slice 1
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These data suggest that the enzyme is well conserved in plants and could play similar physiological roles in angiosperms and gymnosperms.
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Simple trichomes are present on aerial surfaces of most angiosperms and on some gymnosperms and bryophytes.
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Simple trichomes are present on aerial surfaces of most angiosperms and on some gymnosperms and bryophytes.
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Extant vascular plants range from clubmosses and ferns and their allies (such as whisk ferns and horsetails) to complex seed plants, comprising gymnosperms and angiosperms.
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The receptive part of the gymnosperm ovule is called the micropyle.
Pollination
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There are 794 angiosperm genera, 77% of China's total angiosperm species, 24 gymnosperm, 70 pteridophyte and 102 bryophyte genera.
The Sichuan Giant Panda Sanctuaries, China
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Moreover, since the expression pattern is similar in a gymnosperm and in an angiosperm this function appears to be evolutionarily conserved.