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3 results for “Megahertzia”
Fig. 1 in Leaf fossils show a 40-million-year history for the Australian tropical rainforest genus Megahertzia (Proteaceae)
Fig. 1. Megahertzia paleoamplexicaulis leaf specimens. All except (a) are scans by R. S. Hill, University of Adelaide, of D. C. Christophel photographs that were obtained using yellow filtering and fluorescence to show venation; all such images are held in the D.T. Blackburn collection at the University of Adelaide. Compare features shown in Fig. 3. (a, b) P257421 (holotype); (a) recent image, (b) image first shown as fig. 7C in Christophel et al. (1987). (c) AN1806. Note the amplexicaul leaf base. (d) P257291. Note the spinose, acute apex. (e) P257303. (f) P257294. This specimen is likely to have five lobes (including the terminal lobe). (g) AN1807. Scale bar: 1 cm.
Fig. 2 in Leaf fossils show a 40-million-year history for the Australian tropical rainforest genus Megahertzia (Proteaceae)
Fig. 2. Images of Megahertzia paleoamplexicaulis cuticle under (a–d, i) light and (e–h, j) scanning electron microscopy. Compare features shown in Fig. 3. (a) Slide P231730, showing stomata on abaxial side within small areoles. (b) Slide P231734. Note trichome base at upper left and sinuous anticlinal walls. (c) Slide P231730. Note trichome base at upper left and relatively straight anticlinal walls. (d) Slide P231730. Note striations. (e) Outer abaxial surface from leaf AN1806, showing stomatal pores and fine striations. (f) Inner abaxial cuticle from slide P231732. Note slightly granular surface mostly associated with normal pavement cells, and evidence of subsidiary cell striations. (g) Inner abaxial cuticle from leaf P257295. Note granulations. (h) Inner abaxial cuticle from an uncatalogued leaf specimen. Note granulations especially associated with pavement cells. (i) P231735, showing trichome base on adaxial side associated with 11 cells. Note striations radiating from base. (j) Inner adaxial cuticle from slide P231732, showing the position of a trichome base associated with five cells at upper left. Scale bars: (a) 200 µm; (b, c) 100 µm; (e) 50 µm; (d, i) 25 µm; (f, g, j) 20 µm; (h) 10 µm.
Fig. 3 in Leaf fossils show a 40-million-year history for the Australian tropical rainforest genus Megahertzia (Proteaceae)
Fig. 3. Images of extant Megahertzia foliage (a, b), and cuticle, under (c–e, h) light and (f, g, i) scanning electron microscopy. Compare features shown in Fig. 1 and 2. (a) Note amplexicaul leaf bases (courtesy G. Sankowsky, Tolga, Qld). (b) AQ020534. Note lobes, spinose teeth and the acute apex of the lobe at upper right. (c) AQ645333. Note the stomata within obvious areoles. (d) AQ645333. Note cuticular striations; a trichome base is located near centre. (e) AQ645333. Note cuticular striations. (f) Outer abaxial surface, showing stomatal pores and striations. (g) Inner abaxial cuticle associated with a stomate. Note granulations. (h) AQ645333, showing obvious striations. (i) Outer adaxial cuticle showing a trichome base at lower left with radiating striations. Scale bars: (c) 200 µm; (d) 100 µm; (i) 50 µm; (e, h) 25 µm; (f, g) 20 µm.
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