mycorrhiza defined in 1951 yearmycorrhiza - mycorrhiza;
mycorrhiza - 'Fungus root'; an association of a fungus with root of a higher plant. Mycorrhizas are of common occurrence. Two main types exist, (1) endotrophic, in which fungus is within cortex cells of root, e.g. orchid, and (2) ectotrophic, in which it is external, forming a mantle that completely invests the smaller roots, e.g. pine tree. Mycorrhizas are believed to constitute an example of a mutually beneficial symbiotic association, probably evolved from an original host/parasite relationship. It has been clearly shown (a) that my-corrhizal plants benefit from the association, e.g. under natural conditions presence of fungus partner is vital for establishment and growth of seedling trees of a number of different species, e.g. pines, and (b) that association of fungus with tree is necessary for development and reproduction by fungus.
near mycorrhiza in Knolik
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