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Fig. 5 | BMC Evolutionary Biology

Fig. 5

From: Further study of Late Devonian seed plant Cosmosperma polyloba: its reconstruction and evolutionary significance

Fig. 5

Trifurcate fronds of Cosmosperma polyloba. a Frond consisting of a primary rachis, a median and two subopposite secondary rachises and two tertiary rachises. Arrow indicating portion enlarged in Fig. 5(d). PKUB13510a. Scale bar = 20 mm. b Frond consisting of a primary rachis, a median and two subopposite secondary rachises and alternately borne tertiary rachises. One cupulate ovule (arrow, enlarged in Fig. 6 e) associated with the frond. PKUB13511. Scale bar = 20 mm. c Frond consisting of a primary rachis, a median and two subopposite secondary rachises, a tertiary rachis and an ultimate pinna. Arrow indicating portion enlarged in Fig. 5e. PKUB13512. Scale bar = 20 mm. d Enlargement of Fig. 5 (a, arrow), showing attachment of a median and two secondary rachises. Parallel vertical striations distributed along primary rachis, basal parts of median and secondary rachises. Arrows indicating conical prickles. Scale bar = 5 mm. e Enlargement of Fig. 5 (c, arrow), showing an ultimate pinna with poorly preserved pinnules. Scale bar = 5 mm

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