Fig. 2From: Range extension and morphological characterization of rhodolith-forming species (Corallinales, Rhodophyta) from shallow water in the Mexican South Pacific Lithothamnion muelleri. Vegetative morphology and anatomy (longitudinal sections: b–i). a Fructicose growth form. b Flared epithallial cells (arrow) and subepithallial initials cells (double arrow). c Perithallial filaments with cell fusions between cells of adjacent filaments (arrow). d Multiporate tetrasporangial conceptacle roof shows a densely stained pore plug (arrow). e Pore canals (double arrow), note that roof cells adjacent to pore canals are similar in size and shape to other roof cells (arrow). f Zonated tetrasporangium. g Multiporate tetrasporangial conceptacle with zonated tetraspores (arrow). h Multiporate tetrasporangial conceptacle (arrow) is raised in relation to the surrounding vegetative thallus surface. i Senescent conceptacle in the central region of the thallus (arrow)Back to article page