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. 2017 Feb 22;14(127):20160933. doi: 10.1098/rsif.2016.0933

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© 2017 The Author(s)

Published by the Royal Society. All rights reserved.

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Figure 2. — Coloration of a glossy R. acris petal. (a) The glossiness is restricted to the main distal area of the upper (adaxial) side. (b) Close-up of the area indicated by the rectangle in (a), showing granular rows in the main petal area with oblique illumination. (c) The same area with normal epi-illumination. (d) The same area and illumination, but with crossed polarizer and analyser. (e) Close-up of a petal with disrupted upper epidermis, showing white starch cells. (f) Isolated upper epidermis observed in transmitted light. Scale bars: (a) 1 cm, (b–d) 1 mm, (e) 100 µm, (f) 50 µm.