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XXXII.—On Old Red Sandstone Plants showing Structure, from the Rhynie Chert Bed, Aberdeenshire. Part IV. Restorations of the Vascular Cryptogams, and Discussion of their bearing on the General Morphology of the Pteridophyta and the Origin of the Organisation of Land-Plants

  • R. Kidston and W. H. Lang (a1)

Extract

This part of the account of our examination of the plants preserved in the silicified peat-bed of early Old Red Sandstone age found at Rhynie will be devoted to the consideration of a number of general questions concerning the four Vascular Cryptogams which it has yielded.

1. In the first place the morphological characters of Rhynia Gwynne-Vaughani, R. major, Hornea, and Asteroxylon will be reviewed and the attempt made to reconstruct the external appearance of these plants as they grew. In relation to this a few additional features of the plants will be described.

2. This will lead naturally to a consideration of the general bearings upon plant-morphology of the facts mentioned in this series of papers.

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page 831 note * Trans. Roy. Soc. Edin., vol. li, p. 761; vol. lii, pp. 603, 643.

page 834 note * Cf. Sorauer, , Pflanzenkrankheiten, Aufl. 3, Bd. 1, p. 435 ff. Kuster, Pathologische Pflanzenanatomie, Aufl. 2, p. 44 ff.

page 834 note † Smith, Erwin F., “Mechanism of Tumor Growth in Crown Gall,” Jour. Agric. Res. (Washington), vol. viii, pl. 60, etc.

page 838 note * The term Early Devonian is here used to include the period represented by the Lower and Middle Old Red Sandstone, but to exclude the Upper Old Red Sandstone.

page 846 note * Since we are dealing with general comparative morphology, and not with relationship, another more distant comparison may be made with the leafless rhizome-system of the gametophyte of some Liverworts (e.g. Calobryaceæ).

page 846 note † The repetition of the specialised tuberous protocorm of Phylloglossum may also be compared here.

page 851 note * Engler's Bot. Jahrb., Bd. xlii (1908), p. 31.

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Earth and Environmental Science Transactions of The Royal Society of Edinburgh
  • ISSN: 1755-6910
  • EISSN: 1755-6929
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