Keywords: The Oak (Marshall Ward) Fig 25.jpg Fig 7 the outer layers of which are infested with fungus hyphæ f mycorhiza ; r c root-cap; m embryonic tissue from which all originates; P pith; sp spiral vessels of the primary xylem; c cortex 1892 The Oak A Popular Introduction to Forest-Botany H Marshall Ward PD-old-100 The Oak Marshall Ward |