FIGURE 9. Lithothamnion sp. F. Specimen LAF6882. A. Thallus habit showing numerous protuberances. Scale bar 7 mm. B. Section of protuberance showing two overgrown conceptacles (arrows), one including numerous putative aragonite crystals (circle arrow). Scale bar 290 μm. C. New growth layer growing over older part (left bracket) of the thallus showing secondary hypothallium (lower right bracket) and upwardly branched tiers of perithallial filaments (upper right bracket). Circle arrow indicates location of developing protuberance. Scale bar 90 μm. D. Perithallium with cell fusions (arrows). Scale bar 20 μm. E. Section and surface view showing perithallium (lower bracket), epithallium (upper bracket) and meristematic cells (M). Scale bar 28 μm. F. Magnified view of epithallial cells lacking cell roofs (arrows) and others with roof intact (circle arrow). Scale bar 10.5 μm.

Published as part of Richards, Joseph L., Vieira-Pinto, Talita, Schmidt, William E., Sauvage, Thomas, Gabrielson, Paul W., Oliveira, Mariana C. & Fredericq, Suzanne, 2016, Molecular and Morphological Diversity of Lithothamnion spp. (Hapalidiales, Rhodophyta) from Deepwater Rhodolith Beds in the Northwestern Gulf of Mexico, pp. 81-114 in Phytotaxa 278 (2) on page 100, DOI: 10.11646/phytotaxa.278.2.1, http://zenodo.org/record/13645891