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  2. Conifer cone - Wikipedia

    en.wikipedia.org/wiki/Conifer_cone

    A mature female big-cone pine (Pinus coulteri) cone, the heaviest pine cone A young female or seed cone on a Norway spruce (Picea abies) Immature male or pollen cones of Swiss pine (Pinus cembra) A conifer cone or, in formal botanical usage, a strobilus , pl. : strobili , is a seed-bearing organ on gymnosperm plants, especially in conifers and ...

  3. Gnetophyta - Wikipedia

    en.wikipedia.org/wiki/Gnetophyta

    Gnetophyta (/ n ɛ ˈ t ɒ f ɪ t ə, ˈ n ɛ t oʊ f aɪ t ə /) is a division of plants (alternatively considered the subclass Gnetidae or order Gnetales), grouped within the gymnosperms (which also includes conifers, cycads, and ginkgos), that consists of some 70 species across the three relict genera: Gnetum (family Gnetaceae), Welwitschia (family Welwitschiaceae), and Ephedra (family ...

  4. Conifer - Wikipedia

    en.wikipedia.org/wiki/Conifer

    Most conifers are monoecious, but some are subdioecious or dioecious; all are wind-pollinated. Conifer seeds develop inside a protective cone called a strobilus. The cones take from four months to three years to reach maturity, and vary in size from 2 to 600 millimetres (1 ⁄ 8 to 23 + 5 ⁄ 8 in) long.

  5. Pollen tube - Wikipedia

    en.wikipedia.org/wiki/Pollen_tube

    Conifers can be branched or unbranched and they cause degeneration of the female tissue as it grows through more tissue. [clarification needed] [18] Pines, for instance discharge cytoplasm of the sperm and union of the one sperm occurs as the other sperm degenerates. Yet, in Gnetophyta, there are features more similar to angiosperm pollen tubes ...

  6. Athrotaxis cupressoides - Wikipedia

    en.wikipedia.org/wiki/Athrotaxis_cupressoides

    This results in a scale like appearance. Two forms of woody cones act as the gametophyte structures, which mature approximately six months after pollination and are typically retained on the tree for up to one year. The female cones are spherical with pointed bract scales 12–15 mm in diameter. The male cones are much smaller 3–5 mm in diameter.

  7. Abies amabilis - Wikipedia

    en.wikipedia.org/wiki/Abies_amabilis

    The shoots are orange-red with dense velvety pubescence. The cones are 9–17 cm (3 + 1 ⁄ 2 – 6 + 3 ⁄ 4 in) long and 4–6 cm (1 + 1 ⁄ 2 – 2 + 1 ⁄ 4 in) broad, dark purple before maturity; [4] the scale bracts are short, and hidden in the closed cone. The winged seeds are released when the cones disintegrate at maturity about 6–7 ...

  8. Meet the daring tree climbers needed to replant 1.5 million ...

    www.aol.com/meet-daring-tree-climbers-needed...

    Gov. Gavin Newsom’s Forestry and Fire Task Force found that 1.5 million acres of California forest were scorched by 70% high-severity fire during the 2019-2021 fire seasons, according to an ...

  9. Araucaria bidwillii - Wikipedia

    en.wikipedia.org/wiki/Araucaria_bidwillii

    The cones of the bunya pine are some of the largest produced by the conifer family. The cones—which can grow to as much as 35 centimetres (14 in) in diameter when mature, and weigh up to 10 kilograms (22 lb)—can drop on unsuspecting passersby from heights of 40 metres (130 ft) or more. [ 45 ]