ectotrophicadj.

1903 W. H. Lang Strasburger's Text-bk. Bot. (ed. 2) i. ii. 209 The fungal hyphæ are sometimes present..within the cells... In other cases the fungus surrounds the young roots with a dense investment of interwoven hyphæ. The former arrangement is spoken of as endotrophic, the latter as exotrophic [later edd. ectotrophic] mycorhiza.]

1899 Ann. Bot. 13 7 The presence of an endotropic mycorhiza in the roots of the Aplectrum would lessen the tendency to the formation of an ectotropic layer with a second fungus.

1926 A. G. Tansley & T. F. Chipp Aims & Methods Study Vegetation ix. 158 Ectotrophic [fungi]..are found..mainly as a mantle around the rootlets of trees.

1938 J. E. Weaver & F. E. Clements Plant Ecol. (ed. 2) xi. 329 If the fungal mycelium occurs on the outside of the root and between its cells..the mycorrhiza is ectotrophic (i.e., nourished outside).

1959 New Scientist 24 Sept. 528/2 The well-defined ectotrophic mycorrhizas of certain forest trees, and the more variable endotrophic condition of the majority of plants.