| R. holmesii | R. caespitosa | R. delicatula | R. pseudopalmata | R. pseudopalmata var. fuscopurpurea | S. nicaeensis |
---|---|---|---|---|---|---|
Height | To 80Â mm | To 300Â mm | To 22Â mm | To 120Â mm | To 80Â mm | To 100Â 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 (as R. peudopalmata var. pseudopalmata); Irvine 1983 | Dangeard 1949 | Guiry and Hollenberg 1975; L’Hardy-Halos 1976; RodrÃguez-Prieto et al. 2013; Guiry and Guiry 2015 |