Page 6 - Basso_et_al_2011_Phycologia_L_crispatum

Basso et al.: Lithothamnion crispatum Hauck 149

Figs 13–16. Tetra/bisporangial conceptacles of the lectotype of Lithothamnion crispatum Hauck.
Fig. 13. Longitudinal section through a buried tetra/bisporangial conceptacle showing pore canals (arrowheads) within depressions and
regular conceptacle roof filaments (arrow). LM photograph, EA2 slide 4. Scale bar 5 100 mm.
Fig. 14. Detail of Fig. 13. Pore plate depressions across a tetra/bisporangial conceptacle roof showing pore canals (arrowheads) bordered
by filaments shorter than the regular surrounding roof filaments that are topped by already disintegrated rosette cells (u and arrow). LM
photograph, EA2 slide 4. Scale bar 5 25 mm.
Fig. 15. Detailed surface view of an immature tetra/bisporangial conceptacle roof showing rosette cells (labelled 1 to 7) around a central
pore canal (p). SEM photograph, stub 8506b1B. Scale bar 5 20 mm.
Fig. 16. Tangential section of a tetra/bisporangial conceptacle roof showing central a pore canal (p) bordered by rosette cells (1–6). LM
photograph, EA1 slide 3. Scale bar 5 50 mm.

species of Lithothamnion. Our observations on the type Farias 2009; da No´ brega Farias et al. 2010 and this study)
material of L. philippii are in agreement with the results of possess cylindrical protuberances flaring distally into curly
Cabioch & Mendoza (1998), who concluded that it is not margined, funnel-like or cup-shaped tips. Hauck (1878)
conspecific with L. crispatum. Mediterranean and western considered this feature distinctive of the species, and
Atlantic rhodoliths of L. crispatum (Hauck 1878; Cabioch selected the specific epithet crispatum accordingly. On this
& Mendoza 1998; Bressan & Babbini 2003; da No´ brega basis, the species was known as a Mediterranean endemic.

r
Fig. 11. Longitudinal section of the thallus showing the monomerous construction with plumose hypothallium (h) and zoned perithallium
(p). C-MF5 slide 2. Scale bar 5 200 mm.
Fig. 12. Outer perithallium showing flattened and flared epithallial cells (e) subtended by subepithallial initials. SEM photograph, stub
4894b4. Scale bar 5 4 mm.