A trichome wing is the outward-spreading part of a specialized trichome, especially evident in the surface scales of Tillandsia usneoides. Its flexible geometry contributes to how a water film moves over the plant surface. The term describes part of a trichome, rather than an aerial locomotion organ.
A 2021 experiment compared water movement on shoots with intact trichome wings and preparations without those wings. Fluorescence revealed the spreading liquid, while X-ray observations linked water movement with sequential deformation of flexible wings. Neighboring structures therefore form an interacting transport surface, rather than a collection of independent hairs.[ref]
Domino-like water transport on Tillandsia through flexible trichome wings by Nami Ha and others. Results: external water transport and sequential deformation; Figure3: intact/removed-wing fluorescence comparison
For an original measurement example, suppose a fluorescent front travels4 millimetres in2 seconds with one preparation and the same distance in4 seconds with another. The corresponding average surface speeds are2 and 1 millimetres per second. These invented values describe spreading along the surface; they do not measure how much water entered living cells.
A controlled comparison should therefore distinguish surface propagation, subsequent uptake and damage caused by removing a structure. The wing-removal experiment helps test a mechanical contribution to transport, while the fluorescence readout makes the spatial movement visible.
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