aus den Lenneschiefern der Gegend von Grafrath am Niederrhein. 99 
J. Stourie 1)5 On the occurrence of Pachytheca and a species of Nematophycus 
in the siluriau beds at Tymawr quarry Rnmnay. Report Brit. Association 1891, 
Cardiff p. 652. 
D. Stur'), Die Silurtlora der Etage H-h in Böhmen. Sitzungsber. d. K. 
Akad. d. Wiss. zu Wien. Math, naturw. Classe Bd. 84, Abth. I (1882), p. 330 sq. 
Lardner Vanuxem '), Natural History of New-York. Geology pt. VII (1842). 
Weiss'), Zur Flora der ältesten Schichten des Harzes. Jahrb. d. Königl. 
preuss. geol. Landesanstalt 1884 (Berlin 1885). 
Literatur für Pachytheca Hook. 
1) H. E. Strickland, On the distribution and organic contents of the Ludlow 
bone bed in the districts of Woolhope and May Hill. With a note on the 
seedlike bodies found in it by J. D. Hookek. Quarterly Journ. geol. soc. 
London, vol. 9 (1853), p. 8. 
2) J. W. Dawson, Notes on new Erian (Devonian) plaiits. Quarterly Journ. 
geol. soc. London, vol. 37 (1881), p. 306. 
3) J. W. Dawson, Notes on Prototaxites and Pachytheca from the Denbigshire 
grits of Corwen, North Wales. Abstracts of the Proceed. Geol. soc. London. 
Session 1881 — 82, n. 409, Nov. 16, 1881. 
4) J. Dawson, The fossil plants of the Erian and upper Silurian formations 
of Canada. 11. Geological Survey of Canada 1882, p. 108. 
5) J. D. Hooker, On Pachytheca, Annals of Botany, vol. HI, 1889 — 1890, 
p. 135 sq., t. VIII. 
6) C. A. Barber, The structure of Pachytheca, Ann. of Bot., vol. HI (1889—90), 
p. 141 sq., tb. IX. 
7) C. A. Barber, The structure of Pacltytheca II, Ann. of Bot., vol.V, p. 145 sq., 
tb. IX (1890-91). 
8) J. Stourie, On the occurrence of Pachytheca etc. Report British Association 
1891 (Cardiff) p. 652. 
[ 7 *] 
