sporangia-bearing

Updated: May 28, 2025

In others the stems are all alike, green and crowned with a conelike spike of sporangia-bearing scales. Manifestly the dimorphous cases are to be considered as the younger ones, partly because they are obvious exceptions to the common rule, and partly because the division of labor is indicative of a higher degree of evolution.

Hugo de Vries - Species and Varieties, Their Origin by Mutation