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Pine (Pinus) stem cross section with tannin cells in phloem

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Populus deltoides (cottonwood) leaf clearing with focus on lower epidermis showing stomates in all stages of development.

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Pinus strobus (eastern white pine) leaf torn to show stomates from within and torn ends of plicate mesophyll cells (SEM

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Populus deltoides (cottonwood) cleared leaf showing stomate developmental stages on the abaxial epidermis.

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Populus tremuloides (quaking aspen) leaf clearing showing abaxial epidermis with developmental stages of stomates.

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Urtica dioica (stinging nettle) abaxial epidermis, stomates, and vascular bundles.

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Populus tremuloides (quaking aspen) leaf clearing with focus on lower epidermis with stomates and cuticular ridges.

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Ligustrum (privet) leaf paradermal section intercepting veins and spongy mesophyll.

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RicinFruLsSeedLab.jpg (398×453)

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Fragaria (strawberry) spiral primary cell walls. Lersten and Curtis. 1976. Canadian J. Bot. 55: 128-132.