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Pinnularia (pin-you-lair-ee-a). a pennate diatom, found either individually or in clusters as here. As with other diatoms with a siliceous cell wall. Nucleus central. Phase contrast.
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Pinnularia (pin-you-lair-ee-a). a pennate diatom, found either individually or in clusters as here. As with other diatoms with a siliceous cell wall. Nucleus central. Differential interference contrast.
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Pinnularia (pin-you-lair-ee-a) a pennate diatom, the upper cell is the empty siliceous wall or frustule, the lower cell is a living cell with brown-ish chloroplast and central nucleus. Diatoms are mostly identified and classified using the markings on the surface of the frustule. The central line is the raphe, and is associated with the gliding movements of the cell. Differential interference contrast. Material from Nymph Lake, thermal sites within Yellowstone National Park, photograph by Kathy Sheehan and David Patterson.
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Pinnularia (pin-you-lair-ee-a), large pennate diatom. Margins reveal strengthening struts. The plastid has a browny-green colour. Phase contrast.
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The intricate frustule of the diatom Pinnularia. Frustules have ridges, grooves, and pores that are useful for identification of different diatoms. The two grooves in the center of the cell form the raphe and the raphe is used for propelling the diatom.
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Diatom frustules are brittle and delicate. This Pinnularia frustule was broken when it was flattened between the microscope slide and the coverslip.
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Collected from Le Barron white cedar swamp on July 1, 2004.
