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146 Phycologia, Vol. 50 (2), 2011

Figs 1–6. Vegetative anatomy of the lectotype of Lithothamnion crispatum Hauck.
   Fig. 1. Plumose hypothallium passing to a thin perithallium. SEM photograph, stub 8506b1C. Scale bar 5 100 mm.
   Fig. 2. Longitudinal section of the thallus showing the monomerous construction with plumose hypothallium (h) and zoned perithallium
   (p). LM photograph, EF8 slide 37. Scale bar 5 100 mm.
   Fig. 3. Longitudinal section of the hypothallium showing extensive cell fusions between cells of adjacent hypothallial filaments (arrows).
   LM photograph, EC3 slide 3. Scale bar 5 50 mm.
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