TABLE 3. — Comparative table between Lithophyllum artabricum V in Lithophyllum artabricum V. Peña, sp. nov. (Corallinales, Rhodophyta): a cryptic species in the Atlantic Iberian Peninsula hitherto assigned to Lithophyllum stictiforme (Areschoug) Hauck

TABLE 3. — Comparative table between Lithophyllum artabricum V.Peña, sp. nov. and the Lithophyllum species reported for the Atlantic European coast. Data from: 1, Crouan & Crouan (1867); 2, Foslie (1899); 3, Lemoine (1929); 4, Hamel & Lemoine (1953); 5, Cabioch (1968); 6, Ardré (1970); 7, Adey & Adey (1973); 8, Woelkerling (1983); 9, Afonso-Carrillo (1983); 10, Chamberlain & Irvine (1994); 11, Chamberlain (1997); 12, Bressan & Babbini (2003); 13, Peña et al. (2013); 14, Hernández-Kantun et al. (2015a); 15, Cormaci et al. (2017); 16, Pezzolesi et al. (2017); 17, Peña et al. (2018); 18, Richards et al. (2018); 19, present study.
L. artabricumL.bathyporumL. byssoides L.crouaniorumL. dentatum L. hibernicum L. incrustans L. nitorum sp. nov. 19 1, 10, 14 8, 11, 16 10 4, 12, 14, 15 10, 14 5,8, 10, 13, 14 7, 10, 17L L.orbiculatumsubtenellumL. vickersiae 10 2, 18 3,4, 6, 9lamellae, fan-shaped,Encrusting smooth or Encrusting with numerous with or without excrecences; protuberances;Habitfinger-like Lamellae Encrusting branchesEncrusting Lamellaeunattached (rhodolith)unattached (rhodolith)Encrusting EncrustingEncrusting EncrustingSizeUp to 10 cm 2 cm10 cmUp to 15 cm Up to 20 cm Up to 10 cmUp to 10 cmUp to 2 cmUp to 2.5 cm – Dark grey-Up to 3 cmColorLight pink, dark pink, violetPinkgreenish white, pink, greyish Pink, mauve Ruddy purple mauvePink to dark pink and purple.purple, White to pink, Dark to pale greyish, violet to lilac- pink, orange- yellowish to gray pink beige PurplishPink to grey pinkConcentric lines (lower surface) Present–––––––––Maximum thickness (mm)<2.51.5 Dimerous<0.8 4 Monomerous,1.5<0.512 Dimerous,12.50.5Thallus constructionMonomerous (mainly)dimerousDimerousMonomerous Monomerous Monomerousmonomerous Dimerous DimerousDimerousMedullary cells (length, µm) Medulllary cells (height /6-47–11-31(4) 8-13 (26) 10-427-206-3810-208-203.5–87-10diameter, µm) Cortical cells (length, µm) Cortical cells (diameter, µm) Number epithallial cells4-27 (3) 4-19 3-21 1 (2)– – – –2-9 3-9 4-18 Up to 47-33 6-28 (4) 7-16 4 (6)6-11 4-41 6-11 14-7 7-20 4–7 2-34–14 5-41 5-11 1-3 Rectangular, rounded-9-27 5-41 7-20 1-211-21 10-21 7-14 5-65.4-7 7-10 6-8.2 (15) 3-14 3.5-6 (7) 3-10 1 (2) 2-3 RectangularShape epithallial cells Flattened Epithallial cells (length, µm) 1-3 Epithallial cells (diameter, µm) 6-13Squarish, flat, – domed Flattened – 4-6 – – 3-7 – swollen cellsrounded, elliptical 3-6 7-11Flattened to triangular 3-4 3-4elliptical to flattened 3-6 6-11Flattened to triangular Rectangular – 1-2 - – 7-8 – – Large thick- walled cellsto ovoid, flattened – –Trichocytes–that may be trichocytes–(in European collections) –– Flush with– – Not protruding, pore usually Protrudingthat may be trichocytes Flat with central pore–– SlightlyTetra/bisporangial Flush with conceptacles (surface view) the surface SunkenSlightly protrudingFlush with Not thallus surface protruding Cylindricalthallus surface slightly lower or/and sunken than surfacesurrounded surrounded by a white rim by a disc–protruding to sunkenand narrowerShape of pore canal (fromin the Likely tapering middle partbottom to top)Tapering––(fig. 20)10(fig. 152D)12. CylindricalTaperingTaperingTapering––