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XXIX.—Notes on Fossil Plants from the Old Red Sandstone of Scotland. II. Nematophyton Forfarense, Kidston sp. III. On Two Species of Pachytheca (P. media and P. fasciculata) based on the Characters of the Algal Filaments

Published online by Cambridge University Press:  06 July 2012

R. Kidston  and
W. H. Lang
R. Kidston
Affiliation:
Barker Professor of Cryptogamic Botany in the University of Manchester.
W. H. Lang
Affiliation:
Barker Professor of Cryptogamic Botany in the University of Manchester.
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Extract

In 1897, a description was given of a silicified specimen from the Old Red Sandstone of Reswallie near Forfar which was named Cryptoxylon Forfarense. In this note evidence is brought forward for placing the plant in the genus Nematophyton.

For an account of the specimen and of its structure reference may be made to the original description and the figures, which are based on photographs. The stem was shown to consist of an apparently parenchymatous tissue, in which groups of smaller cells occurred. These isolated groups form dark spots, which are arranged concentrically in the transverse section and are slightly elongated in the longitudinal direction. In discussing the affinities of the plant it was noted that it appeared to be essentially distinct from Nematophyton, since in that plant the tissue is entirely composed of long tubes.

Type
Research Article
Information
Earth and Environmental Science Transactions of The Royal Society of Edinburgh , Volume 53 , Issue 3 , 1925 , pp. 603 - 614
Copyright
Copyright © Royal Society of Edinburgh 1925

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References

page 604 note * [Since this paper was read we have obtained evidence that a specimen collected by Mr D. Tait in the Glen of Cults, Gartly, Aberdeenshire, is undoubtedly Pachytheca (cf. Mem. Geol. Survey, Scotland. Explanation of sheets 86 and 96, p. 180). This provides a record of the genus from rocks that are regarded as of Middle Old Red Sandstone Age.—June 1924.]

page 604 note † Q.J. Geol. Soc., vol. ix, p. 10.

page 604 note ‡ Ibid., vol. ix, p. 12.

page 604 note § Ibid., vol. xvii, p. 162.

page 605 note * Ann. Bot., vol. v, p. 145–7., pl. ix, figs. 8–14.

page 605 note ‡ Ibid., vol. xxxvii, p. 482 ff.

page 605 note ∥ Ann. Bot., vol. iii.

page 605 note ** Ibid., vol. iii, p. 147.

page 605 note † Q.J. Geol. Soc., vol. xxxviii, p. 108.

page 605 note § Ibid., vol. xxxvii, p. 306.

page 605 note ¶ Ibid., vol. iii.

page 605 note †† Ibid., vol. v.

page 608 note * A similar projection has been observed in a specimen of P. sphærica from the Downtonian at Ludlow that was collected by Professor Hickling and is preserved in the Manchester Museum.

page 608 note † There are, however, some indications from the associated plants mentioned in Dawson's description that his specimen came from the Psilophyton horizon of the Caledonian Old Red Sandstone.

page 608 note ‡ Summary of Progress for 1902 (published 1903), pp. 79, 130. Memoirs of the Geol. Survey of Scotland, “The Geology of Ben Nevis and Glen Coe.” (Explanation of sheet 53.) 1916. Gf. also Explanation of sheet 85, p. 58.

page 608 note § Summary of Progress for 1902, p. 130.