Enclosed Bark as a Pollen Trap

Science  01 Sep 1967:
Vol. 157, Issue 3792, pp. 1067-1068
DOI: 10.1126/science.157.3792.1067


Counts were made of pollen in traps formed by enclosed bark in two remnants of bristlecone pine, Pinus aristata Engelm., from the White Mountains of east-central California. The traps, dated by tree-rings at A.D. 350 and 1300 B.C., contained a major complex of pine-sagebrush pollen and traces of other species, representing the equivalent of the present vegetation.