FIGURE 7. Lithothamnion sp. C. Specimen LAF6820. A. Thallus habit showing unbranched protuberances. Scale bar 12.5 mm. B. Longitudinal sections of protuberance showing numerous overgrown conceptacles, many with putative aragonite infill. Sections are two halves of the same protuberance and show mirroring images of the same structures. Scale bar.5 mm. C. Overgrown uniporate conceptacle, arrow indicates conceptacle pore. Scale bar 240 μm. D. Conceptacle with elongated perithallial cells (arrows) located at the periphery. Scale bar 105 μm. E. Magnified view of area indicated by arrows in D. showing multiple fusions ("F") and centripetal infill of small, calcium carbonate crystals in cells bordering the conceptacles (arrows). Scale bar 17.5 μm. F. Epithallium (upper bracket), perithallium, and meristematic cells ("M"). Arrows indicate epithallial cell lumens and circle arrows indicate epithallial cell roofs. Scale bar 17.5 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 98, DOI: 10.11646/phytotaxa.278.2.1, http://zenodo.org/record/13645891