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Fig. 3 | BMC Evolutionary Biology

Fig. 3

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

Fig. 3

Interpretative diagram showing architecture of bifurcate (a) and trifurcate (b) fronds of Cosmosperma polyloba. The connection between trifurcate frond and fertile rachises bearing synangia (dashed lines with a question mark) is speculative. Abbreviations: pr, primary rachis; sr, secondary rachis; mr, median rachis; tr, tertiary rachis; qr., quaternary rachis; fr, fertile rachis; pn, pinnule

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BMC Ecology and Evolution

ISSN: 2730-7182

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