Featured Microscopist: Spike (M.I.) Walker

Onion Scale Epidermis

Onion scale epidermis

A small section of onion (Allium) bulb scale epidermis, obtained from a scale leaf, was taken from a red variety of onion and its outer epidermis stripped and mounted in water and covered. Note the nuclei and red cell sap. The objective was a plan achromat 16x/0.35 NA using a 1.4 NA differential interference contrast (DIC) condenser. The microscope was a Zeiss Ultraphot III equipped with an automatic 35-millimeter photohead. The film was Fujichrome Velvia. (80x)

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