The roots of a number of higher plants, e.g. the Pine and the Heather, are invested with fungal hyphrc known as mycorhiza. The hyphae absorb water and probably digested food from the humus in the soil, both of which can pass on into the higher plant in exchange for food made by the latter. This is another example of Symbiosis. In a few cases, however, the higher plant has become completely dependent on the fungus for water and food and has lost its green colour. Such plants are called saprophytes though, strictly speaking, they are parasitic on the fungi which are the real saprophytes feeding on humus. Examples of these so-called saprophytes are the Coralroot and the Bird ’s Nest Orchid,

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