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Table 1 Comparison of morphological traits among Late Devonian seed plants

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

Taxon Frond rachis arrangement Length of primary rachis prior to bifurcation (cm) Location of ultimate pinnae Pinnules Fertile rachises bearing pollen organs Prickles
Elkinsia [5] Equally and repeatedly bifurcated 0-13a on secondary and higher orders of rachises Laminate Isotomously and cruciately dichotomized absent
Laceya [17, 18] Pinnate with bifurcated primary rachis up to 15.5 on both primary and secondary rachises absent
Kongshania [8] Pinnate on tertiary rachises Laminate Isotomously dichotomized absent
Yiduxylon [13] Pinnate with bifurcated primary rachis ca. 3 on tertiary rachises Planate and highly dissected absent
Telangiopsis [10] Pinnate with bifurcated primary rachis 0a on secondary rachises Planate and highly dissected Isotomously dichotomized on stems
Cosmosperma Pinnate with bifurcated/trifurcated primary rachis 10.3-21.2 on tertiary rachises Planate and highly dissected Anisotomously dichotomized on stems, frond rachises and cupule surfaces
  1. a: 0 stand for the basally bifurcated primary rachises