File:41598 2021 90180 Fig6 HTML.webp

English: (a,b) Cooksonia hemisphaerica, (c) Cooksonia cambrensis Edwards35, (d–f) Tortillicaulis sp., (g–h) cf. Cooksonia hemisphaerica, (a) Specimen AM 7914. Scale = 1 cm. Specimen showing the gross morphology of the plant. (b) Specimen AM 7914. Scale = 5 mm. Detail of a rounded sporangium that is clearly distinct from the widening subtending axis. (c) Specimen AM5828. Scale = 2 mm. Sporangium and subtending axis. (d) Specimen AM 7956a. Scale = 5 mm. Specimen showing the organisation of the sporangia. An oblique striation is visible at the surface of the sporangium. (e) Specimen AM 7943. Scale = 5 mm. Specimen showing naked axes bifurcating one time before terminating in elongate sporangia. Note the oblique striation at the surface of the sporangia. (f) Specimen AM 7921a. Scale = 5 mm. A dichotomizing naked axis terminally bearing two sporangia. The sporangia bear a distinct oblique ornamentation and are made of two halves that are twisting on each other. (g) Specimen AM 7915a. Scale bar = 1 cm. Specimen showing the gross morphology of the plant. (h) Specimen AM 7925. Scale bar = 5 mm. Detail of specimen Fig. 6g showing the organisation of the sporangia.