Meanings of brown tubers in English

Potatoes were chthonic, forming their undifferentiated brown tubers unseen beneath the ground, throwing a slovenly flop of vines above.

Hal and Mab watched Daddy Blake, and then he let them pull a vine and dig in the hill after the brown tubers.

The roots are long and fibrous, and produce at their extremities numerous small, rounded or oblong, jointed, pale- brown tubers, of the size of a filbert.