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Cross Section of a pine needle.

Pine needles, Pinus nigra (top) and Pinus resinosa (bottom). The amount and pattern of cell wall lignification in the internal tissues of these two superficially similar looking pine needles has been determined to be the causal basis for the “leaf bending test,” often used to discriminate these two species in the field.

Pine Needle magnified a kajillion times. Wow!

micrograph of leaf veins

"Autumn leaf II" by Mariann Johansen Ellis :: ( a monoprint/monotype printed with natural leaves, inked up in etching inks, added gold and metallic inks. )

The Peculiar Lattice Pattern of Lace Plant Leaves, Adrian Dauphinee.

n478_w1150 by BioDivLibrary on Flickr. Field book of insects New York,G.P. Putnam’s sons,1918. biodiversitylibrary.org/item/17499

n120_w1150 | Flickr - Photo Sharing!

Decaying Gunnera Manicata leaf