Note on the interest on Annular Xylem in the Psilophytales

HALLE, T. G. (1916). Lower Devonian Plants from Roragen in Norway. K. Svenska. Vetenskaps. Handlingar. 57.

HARRIS, T. M. (1929). Schizopodium Davidi gen. et. sp. nov., a new type of stem from the Devonian rocks of Australia. Phil. Trans. Roy. Soc. B. 217.

HHEARD, A. O. (1927). On Old Red Sandstone Plants showing structure from Brecon (South Wales). Q. J. Geol. soc. 83.

KIDSTON, R. & LANG, W. H. (1920). On Old Red Sandstone Plants showing structure from the Rhynie Chert Bed, Aberdeenshire. Part 3. Asteroxylon Mackiei. Trans. Roy. Soc. Edin. 52.

KRAUSEL, R. & WEYLAND, H. (1926). Beitrage zur Kenntniss der Devonflora. II. Abh. Senckenberg. Naturf. Ges. 40.

Idem (1929). Ibid. III. 41.

LANG, W. H. (1927). Contributions to the Study of the Old Red Sandstone Flora of Scotland. 6. Zosterophyllum myretonianum. Trans. Roy. Soc. Edin. 55.

Idem (1932). 8. On Arthrostigma, Psilophyton, etc. Ibid. 57.

Idem (1937). On the Plant-remains from the Downtonian of England and Wales. Phil. Trans. Roy. Soc. B. 227.

LANG, W.H.& COOKSON, I. (1930). Some fossil plants of early Devonian type from the Walhalla Series, Victoria, Australia. Phil. Trans. Roy. Soc. B. 219.

Idem (1935). On a flora, including vascular land plants, associated with Monograplus, in rocks of Silurian age, from Victoria, Australia. Ibid 224.

SAHNI, B. (1923). On the theoretical significance of certain so-called “abnormalities”in the sporangiophores of the Psilotaceae. Jorur. Ind. Bot. Soc. 3.

Idem (1925). On Tmesipteris Veillardi, Dangeard, an erect terrestrial species from New Caledonia. Phil. Trans. Roy. Soc. B. 213.