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Fig. 6 | BMC Evolutionary Biology

Fig. 6

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

Fig. 6

Fronds and cupulate ovules of Cosmosperma polyloba. a Frond consisting of distal part of bifurcated primary rachis, two secondary rachises, and one tertiary rachis bearing 11 ultimate pinnae (arrows). PKUB13513. Scale bar = 20 mm. b Combined figure of part and counterpart of one specimen, showing vegetative frond with secondary rachis at possible distal portion and three alternate (pinnate) tertiary rachises bearing ultimate pinnae. Arrow indicating portion redrawn in Additional file 2: Figure S2(d). PKUB13514a, PKUB13514b (dashed polygon). Scale bar = 2 cm. c Frond segment including secondary rachis, alternately (pinnately) borne tertiary rachises with ultimate pinnae. Arrow indicating portions redrawn in Additional file 2: Figure S2(b, c). PKUB13515. Scale bar = 20 mm. d Enlargement of cupulate ovule in Fig. 4(a, arrow 3), showing prickles (arrow) on the outer surface. Scale bar = 2 mm. e Enlargement of cupulate ovule in Fig. 5(b, arrow), showing compression of ovule with a stalk connecting the cupule (lower arrow, enlarged in Fig. 6 f) and four integumentary lobes (upper four arrows). Scale bar = 2 mm. f Enlargement of Fig. 6 (e, lower arrow), showing lower part of ovule with a short stalk. Scale bar = 0.5 mm. g Ovule in Fig. 6e, remnant after removal of integumentary lobes by dégagement. Arrow indicating portion enlarged in Fig. 6 h. Scale bar = 2 mm. h Enlargement of Fig. 6 (g, arrow), showing cupule tips (white star) and remnant of ovule (black star). Scale bar = 0.5 mm

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