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