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Table 1 Morphological characters used to distinguish Rhodymenia holmesii, R. caespitosa, R. delicatula, R. pseudopalmata, R. pseudopalmata var. fuscopurpurea and Schottera nicaeensis

From: First record of Rhodymenia holmesii (Rhodymeniaceae, Rhodophyta) for the Mediterranean Sea from Morocco

  R. holmesii R. caespitosa R. delicatula R. pseudopalmata R. pseudopalmata var. fuscopurpurea S. nicaeensis
Height To 80 mm To 300 mm To 22 mm To 120 mm To 80 mm To 100 mm
Width of fronds To 5 mm 5–12 mm 0.5–3 mm To 10 mm ≥10 mm To 10 mm
Thickness of fronds (μm) 100–188 170–300 (30) 40–70 (100) (60) 100–200 (250) 190–250 110–200
Stolons Present Absent Sometimes formed Occasionally formed Occasionally formed Present
Cortical cells (μm)      Not reported  
 From apex 4–7 × 3–5 3–5 × 2–3 (4) 8.0–14.2 (20.5) 5–7 × 3–4   2–5 × 2–3
 From median part 9–14 × 5–7 3–6 × 2–3 (4) 9–16 9–15 × 6–9   4–9 × 3–5
 From stipe 8–20 × 5–8
Irregularly arranged
Not reported Not reported 4–8 × 3–4
Irregularly arranged
  4–7 × 3–4
Arranged in longitudinal rows in transverse section
Medullary cells (μm)      Not reported Not reported
 in transverse section (24) 41–53 (63) Not reported (15) 25–58 (73) (20) 41–51 (61)   
 in longitudinal section (98) 102–133 (137) Not reported (48) 67–100 (108) (65) 102–133 (153)   
References L’Hardy-Halos 1976; Guiry 1977; Irvine 1983 Dangeard 1949; L’Hardy-Halos 1976 Dangeard 1949; Guiry 1977; Irvine 1983 L’Hardy-Halos 1976; Guiry 1977 (as R. peudopalmata var. pseudopalmata); Irvine 1983 Dangeard 1949 Guiry and Hollenberg 1975; L’Hardy-Halos 1976; Rodríguez-Prieto et al. 2013; Guiry and Guiry 2015