FIGURES 1–4. Gross morphology and vegetative anatomy of Hydrolithon rupestre from the Mediterranean (UWC 14/V3). 1. Encrusting to warty habit (scale bar = 20 mm). 2. Vertical section of the inner thallus showing plumose medullary filaments. Note the cell fusions (f) between contiguous filaments (scale bar = 20 μm). 3. Vertical section of the outer thallus showing a single epithallial cell layer (arrowheads) and solitary to paired trichocytes (T). Note the cell fusions (f) between contiguous cortical filaments and the normal vegetative filaments (arrows) between trichocytes (scale bar = 20 μm). 4. Vertical section through the outer thallus showing buried trichocytes (T) (scale bar = 20 μm).

Published as part of Wolf, M.A., Maneveldt, G. W., Kaleb, S., Moro, I. & Falace, A., 2015, Morphological and molecular characterization of Hydrolithon rupestre (Corallinaceae, Corallinales, Rhodophyta): first report from the Mediterranean Sea, pp. 59-71 in Phytotaxa 224 (1) on page 62, DOI: 10.11646/phytotaxa.224.1.4, http://zenodo.org/record/13636708