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Table 1 Comparison of documented material from Iran and Romania (Phlebopteris formosa) with material of this study (P. woodwardii)

From: The first occurrence of Phlebopteris dunkeri and P. woodwardii (Matoniaceae) from the middle Jurassic of Iran

  Phlebopteris formosa, Iranian material (Schweitzer et al. 2009) Phlebopteris formosa, Romanian material (Givulescu and Popa 1998; Popa and Van Konijnenburg-van Cittert 1999) Phlebopteris woodwardii, Iranian material (this study)
Rachis 6–7 mm, with longitudinal striation 1.5–8 mm, with longitudinal striation or unornamented Approximately 3 mm, with longitudinal striation
Pinnule insertion, angle Unknown, perpendicular Alternate or subopposite, perpendicular Opposite, perpendicular
Pinnule shape Unknown Lanceolate Linear–lanceolate
Pinnule base Missing Roundly constricted Slightly decurrent
Pinnule margin Entire Entire, parallel Entire, parallel
Pinnule apex Missing Unknown Missing
Pinnule length 80 mm, up to 150 mm 70–100 mm over 60 mm (longest), exceeding 60 mm
Pinnule width 12 mm (10–14 mm) 6–9 mm 11 mm (basally), 2 mm (apically)
Midrib Strong Straight, stout Straight, stout
Midrib ornamentation Unknown Unornamented Longitudinal striation
Midrib insertion Unknown Perpendicular Perpendicular
Midrib width 1 mm 0.5–1.5 mm 2 mm
Distance of adjacent midribs Unknown 7–15 mm 9–11 mm
Lateral insertion (secondary vein) Slightly oblique, opposite to subopposite Slightly oblique, 75–85°, opposite to subopposite Perpendicular, opposite to subopposite
Distance of lateral veins 2–3 mm 1.5–2 mm 2–2.5 mm
Dividing Halfway up the lamina, tree-like, without arc, anastomosed Halfway up the lamina, tree-like, without arc, narrow net Lower half or halfway up the lamina, making arc (height more than width), elongated net
Sorus shape Circular, supporting by a short vein Circular, without supporting by a short vein Circular, supporting by a short vein
Sorus diameter 1.5 mm 0.7–0.9 mm 0.9–1 mm
Distance of sorus to midrib 1–2 mm Unknown Approximately 0.5 mm
Number of sporangia 10–14 6–8 5–6
Spores Unknown See Givulescu and Popa 1998 Unknown