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  • Featured: Xylem vessels
    Xylem vessels

    Perforated and pitted secondary walls of dead vessel member cells form these water-conducting tubes which vary in size and in shape A Pits in the side walls of adjoining vessel ...

  • Featured: Root nodule development.
    Root nodule development.

    Nodule development involves a series of chemical signals sent back and forth between rhizobia and their host plants Legumes start this exchange by secreting particular flavonoid compounds from their roots ...

  • Featured: Water-conserving structures in a transverse section of pincushion leaf (Hakea laurina)
    Water-conserving structures in a transverse section of pincushion leaf (Hakea laurina)

    Water-conserving structures in a transverse section of pincushion leaf Hakea laurina In this species leaf guard cells are recessed beneath a ledge of cuticle The ledge creates a small cup ...

  • Featured: Tree Rings: Pine
    Tree Rings: Pine

    Pine is a softwood. It grows fast, so it tends to have wider rings than slower-growing species. Note the difference between the appearance of the heartwood and sapwood.

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