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150 Phycologia, Vol. 50 (2), 2011
Figs 17–22. Tetra/bisporangial conceptacles of Lithothamnion crispatum Hauck from recent collections of Mediterranean specimens.
Fig. 17. A raised tetra/bisporangial conceptacle at the tip of a protuberance. SEM photograph, stub 201106b1A, GR/MMmes1, sample
min90abe120-121 (Elba Island). Scale bar 5 250 mm.
Fig. 18. Buried tetra/bisporangial conceptacle showing pore canals (p and arrows) in depressions. SEM photograph, stub 4894b5
(Marettimo Island). Scale bar 5 100 mm.
Fig. 19. Longitudinal section through a buried tetra/bisporangial conceptacle showing pore plugs (p and arrows) within depressions, and
regular conceptacle roof filaments (arrowhead). LM photograph, CMF1 slide 6 (Marettimo Island). Scale bar 5 100 mm.
