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wood prints ragweed wood prints pollen wood prints allergy wood prints allergen wood prints sem wood prints scanning electron micrograph wood prints micrograph wood prints micrographs wood prints micrography wood prints allergies wood prints allergens wood prints ambrosia wood prints pollen grain wood prints pollen grains wood prints stigma wood prints

photographs ragweed photos pollen photos allergy photos allergen photos sem photos scanning electron micrograph photos micrograph photos micrographs photos micrography photos allergies photos allergens photos ambrosia photos pollen grain photos pollen grains photos stigma photos

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Colored Scanning Electron Micrograph (SEM) of pollen grains on the stigma of a ragweed plant Ambrosia sp. The grains of pollen have a spiked surface appearance. The multi-lobed stigma is green. Ambrosia is a daisy like flower which grows in bare and waste ground. Its pollen is windborne and released in great quantities for cross pollination. Ambrosia pollen acts as an allergen causing hay fever (pollenosis) in allergic individuals. Sufferers produce a sensitive antibody which is found on the surface of cells in the nose and eyes; the antibody reacts to the pollen and the nose, throat and eyes become inflamed. Magnification unknown.