Abstract
Explants derived from widely divergent tissues within the body of the basswood, Tilia americana L. (ovary wall, root and shoot cambia, perimedullary region, petiole), have the same general appearance when growing as a callus culture on identical media. The cambial-derived calli will meld into a single unit when placed in contact in the same culture bottle. Similarly, calli from several sources of wheat, Triticum aestivum L., are indistinguishable in vitro.From the standpoint of purely observational criteria, parenchyma explanted from several organs within the same organism responds in a seemingly identical way to the cultural environment.

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