WTT-D’s statement perverted by Times [4 May 1878, p. 6, on WTT-D’s Royal Institution lectures on vegetable morphology].
S. H. Vines’s work on light inhibition of Phycomyces hyphae ["The influence of light upon the growth of unicellular organs" (1878), Arb. Bot. Inst. Würzburg 2 (1882): 133–47] suggests heliotropism in green plants is independent of, and more primitive than, photosynthesis.
Heliotropism in aerial roots.
Frank Darwin’s work.