FIGURE 4. Padina pavonica. A in Re-examination of the distribution and species diversity of the genus Padina (Dictyotales, Phaeophyceae) in the Mediterranean Sea

FIGURE 4. Padina pavonica. A. Habitus of P. pavonica with the Vauganiella stage (pointed by the arrow). B. Lower surface with broad sori above the hair lines and narrow below the hair lines; in the lower part of the picture to the right is a detail of the section of tetrasporangial sori covered with an indusium. C. Longitudinal section of the rolled part of the apical portion of the thallus showing 2 layers of cells. D. Cross section of the median portion of the thallus showing 3 layers of cells. E. Cross section of the basal portion of the thallus showing 4 layers of cells. F. Cross section of the Vauganiella stage. All photos refer to the sample of Pantelleria except for the photo of the sporangial sori, which refers to the herbarium sheet (CAT1734). Scale bars: A, 1 cm; B (section of tetrasporangial sori)—F, 50 μm; B (inset), 1,5 mm. Photos by G. Marletta.