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XXIV.—On Old Red Sandstone Plants showing Structure, from the Rhynie Chert Bed, Aberdeenshire. Part II. Additional Notes on Rhynia Gwynne-Vaughani, Kidston and Lang; with Descriptions of Rhynia major, n.sp., and Hornea Lignieri, n.g., n.sp.

  • R. Kidston and W. H. Lang (a1)
Abstract

In Part I a general account was given of the silicified peat-bed found at Rhynie, and one vascular plant was described in detail under the name of Rhynia Gwynne-Vaughani. Further study has shown that there are two species of Rhynia which we now distinguish as Rhynia Gwynne-Vaughani and Rhynia major. The account in Part I applies to both these species. Along with them there occurs a plant of similar grade of organisation to Rhynia, though quite distinct from that genus: this we name Hornea Lignieri. Asteroxylon Machiei, on the other hand, which will be described in the next part, was a plant of larger size and much more complex morphology.

We are thus now able to establish the existence and main features of four archaic Vascular Cryptogams from the Rhynie bed. In the present paper additional notes on R. Gwynne-Vaughani are given, and R. major and Hornea Lignieri described in detail. In conclusion, the morphological bearings of the facts will be briefly considered.

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page 603 note * Trans. Roy. Soc. Edin., vol. li, 1917, p. 761.

page 604 note * Trans. Edin. Geol. Soc., vol. x, 1913, pl. xxii, fig. 5.

page 604 note † The magnification of figs. 21 and 22 on PI. V of Pt. I was erroneously given as 20 diameters. These stems are magnified about 14 diameters.

page 604 note ‡ To complete this survey of the illustrations to Part I, it should be stated that the poorly preserved specimen in fig. 75 of PI. X does not belong to Rhynia, but to Asteroxylon.

page 608 note * This is also brought out in comparing figs. 21 and 22 with the other figures on PI. V of Pt. I.

page 609 note * The decayed steles in Pt. I (PL X, figs. 76–78) belong to R. major, and the comparison there made with Dawson's figure of Psilophyton must be modified in so far as the outer dark zone in our specimens is derived from the outer xylem and not as suggested from the altered phloem.

page 609 note † Cf. Pt. I, Pl, IX, fig. 67.

page 610 note * Oliver F. W., “On a Vascular Sporangium from the Stephanian of Grand Croix”, New Phytologist, vol. i, p. 60.

page 612 note * The question whether the fungal hyphae which occur in the intercellular spaces of the rhizome are to be regarded as saprophytic or mycorhizic will be considered in a later paper when dealing with the fungi occurring in the Rhynie peat. Their frequent presence must, however, be mentioned here.

page 618 note * Halle T. G., “Lower Devonian Plants from Röragen in Norway”, Kongl. Svensk. Vetenskapsahed. Handlingar, Bd. 57, 1916, p. 27, pl. iii, figs. 10–32.

page 618 note † Loc. cit., p. 31.

page 618 note ‡ Loc. cit., p. 40.

page 619 note * Salvinia and some of the smallest Hymenophyllaceæ may be mentioned, but the rootless condition in them appears to be due to reduction.

page 619 note † Solms , Annales du Jardin Bot. Buitenzorg, vol. iv, 1884, pp. 139190.

page 619 note ‡ Holloway , Trans. New Zealand Institute, vol. 1, 1917, pp. 144.

page 619 note § Treub , Annales du Jardin Bot. Buitenzorg, vols, iv and viii.

page 620 note * Holloway , Trans. New Zealand Institute, vol. xlviii, 1915, pp. 253303.

page 620 note † Ibid., vol. xlix, 1916, p. 90.

page 620 note ‡ Treub , Annales du Jardin Bot. Buitemorg, vol. viii, 1890, p. 30.

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Earth and Environmental Science Transactions of The Royal Society of Edinburgh
  • ISSN: 1755-6910
  • EISSN: 1755-6929
  • URL: /core/journals/earth-and-environmental-science-transactions-of-royal-society-of-edinburgh
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