The seasonal occurrence of various atmospheric pollen is primarily determined in two ways:
1) The presence and abundance of these pollen investigated by samplers and field observations of the source plants growing in the vicinity.
2) Periodic examination of plants known or suspected to shed airborne pollen and dated observations as to the maturation of the male cones and flowers over a period of several years will accumulate the desired information. These data greatly aid in the identification of pollen from dated samples. The presence of some genera in the samples and the local observations may not always exactly correlate. Winds may bring in some pollen before the local sources release them.
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