FIGURES 7–9 in Systematic survey of Lithothamnion, Melobesia and Mesophyllum species (Hapalidiaceae, Corallinales, Rhodophyta) recorded along the Atlantic coast of Mexico

FIGURES 7–9. Lithothamnion occidentale, Campeche Banks (ENCB 19646). 7) Habit of two rhodoliths. 8) Transversal Section of branches, note the medulla (arrow) and cortex. 9) Section through mature tetrasporangial conceptacle, note the tetrasporangium (arrow) and in the box at the top right note two pore canal (arrows). FIGURES 10–12: Lithothamnion sejunctum, Banco Chinchorro (ENCB 18682). 10) Habit of a plant encrusting rocks. Brace indicated a species of Lithophyllum. 11) Section through the thallus showing monomerous construction, note the medulla (brace). 12) Section through dorsal region note the cortex (arrow).