Figure 5
From: Adaptation and interaction of saxicolous crustose lichens with metals
A-C Acarospora smaragdula (Alstrup 77899). (A) Section in reflected light; a (black arrow) = pale yellow-green, Cu-rich cortex, b = darker green algal layer; (B) squashed section in H2O, transmitted light between crossed polars; a = cortex (birefringent), b = medulla (in extinction), c = apothecium (in extinction); (C) squashed section, KOH, transmitted light between crossed polars showing red, needle-shaped crystals arising from cortex which has changed red; (D) Acarospora sinopica, Parys Mountain, resin-embedded section; (E) Acarospora smaragdula (?Acarospora amphibola), Rug Church, on wall beneath metal grille, 19 April 2002. Photobiont arrangement may reflect taxonomy and/or environmental factors. [Figure 5A adapted from Figure 3A, Purvis et al., 1987; Figure 5B adapted from Figure 3B, Purvis et al., 1987.