ecadn.

1905 F. E. Clements Res. Methods Ecol. iii. 148 On the basis of their..behavior in the production of new forms, species may be distinguished as variable, mutable, or adaptable. The new form which results from variation is a variant; the product of mutation is a mutant, and that of adaptation, an ecad.

1920 Nature 26 Feb. 708/1 The so-called species of the mycologist is comparable with the ‘ecad’ of the ecologist, and is the resultant of the organism and its environment. ‘Ecads’ indistinguishable from each other may be produced from two distinct organisms interacting with one and the same environment, or with two different environments.

1964 V. J. Chapman Coastal Vegetation ii. 47 Another free-living fucoid, Ascophyllum nodosum ecad scorpioides is to be found..on the salt marshes of the western Scottish lochs.

1970 Watsonia 8 26 It is concluded that P. pseudodistans and P. fasciculata are ecads of one species.