Figure 3. Transversal histological sections of the CCA, Hydrolithon boergesenii affected by CWPD stained in Sharman’s (1943) stain.

(A) Overview with locations of the healthy (HT) and diseased areas (DT) enlarged in (B) and (D). (C) shows the boundary (B) between healthy and diseased areas. Note the absence of a transition area highlighted by sudden loss of staining. B, Boundary; Co, conceptacle; Ep, epithallial cells; Cw, cell wall (silver stain); P, protoplasm (orange to dark stain).