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Stems of Cosmosperma polyloba. a-c Stems illustrating helically arranged primary rachises with swollen bases. Arrow in Fig. 2 b indicating portion enlarged in Fig. 2 e. PKUB13505-PKUB13507. Scale bars = 20 mm. d Stem with one dichotomous frond rachis. PKUB13508. Scale bar = 20 mm. e Enlargement of Fig. 2 (b, arrow), showing conical prickles (arrow) and parallel vertical striations. Scale bar = 5 mm
