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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//

Pine stem cross section

~~ Underside of the leaf of a giant Amazonian waterlily, Victoria cruziana ~~

Leaf growth -- Anatomia Vegetal 1929, pub. by FE Wachsmuth d by peacay, via Flickr

Trinacria pileolus Diatom cell Courtesy of Ekaterina Nikitina Image Details Instrument used: Quanta Family Magnification: 3000 x Horizontal Field Width: 40 μm Voltage: 20 kv Working Distance: 15 mm Detector: ETD