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This is a perfect example of endotrophic root growth within the tiny, inadequate “green strip” and the curb and sidewalk.

Fungal hyphae occur in the rhizoids and in the cells of the lower region of the thallus of many liverworts, as in the endotrophic mycorhiza of higher plants.

As Macaulay would say, "every school boy knows" now that leguminous root nodules are endotrophic mycorrhiza,—but the Romans did not!