tubers (plural noun) a much thickened underground part of a stem or rhizome, e.g. in the potato, serving as a food reserve and bearing buds from which new plants arise.
XT2, 50-140 f/2.8, straight out of camera JPEGs using custom provia/standard simulation (+grain, lowered shadows, -2 sharpness, +1 highlights. The square one was shot in 1:1 jpeg fine. The other two were Raw + Jpeg 3:2. Scaled down in Gimp 1. 2. 3.