Fig. 4From: Osmunda pulchella sp. nov. from the Jurassic of Sweden—reconciling molecular and fossil evidence in the phylogeny of modern royal ferns (Osmundaceae)Anatomical and cytological details of Osmunda pulchella sp. nov. from the Lower Jurassic of Skåne, southern Sweden (A–F, I: NRM-S069656; G, H, J, K: NRM-S069658). a Detail showing pith parenchyma (bottom), stelar xylem cylinder dissected by complete leaf gaps, triangular section of phloem projecting into leaf gap, and parenchymatous inner cortex (top); note mesarch leaf-trace protoxylem initiation in the stelar xylem segment on the right. b Detail of (a) showing peripheral pith parenchyma and stem xylem. c Detail of stem xylem showing tracheid pitting. d Endarch leaf trace emerging from the stele and associated with a single root. e Leaf trace in the inner cortex of the stem showing single, endarch protoxylem cluster. f Leaf trace immediately distal to initial protoxylem bifurcation in the outermost cortex of the stem. g Root vascular bundle showing well-preserved scalariform pitting of metaxylem tracheids. h Well-preserved pith parenchyma showing membrane-bound cytoplasm with cytosol particles and interphase nuclei containing nucleoli. i, j Nuclei with conspicuous nucleoli (in interphase: I) or with distinct chromatid strands (in prophase: J). k Transverse section through root showing diarch vascular bundle, parenchymatous inner cortex with isolated fibre strands, and prominent fibrous outer cortex. Scale bars: (a) = 100 μm; (b, e, f, h) = 50 μm; (c, g) = 25 μm; (d) = 200 μm; (i, j) = 5 μm; (k) = 250 μmBack to article page