282 
Mr Arber , Notes on the Binney Collection 
the plant. The corresponding radial, and tangential longitudinal 
sections, of the type, were easily distinguished by measurements, 
in comparison with the transverse sections. 
The structure of Lyginodendron Oldhamium is now so well 
known, that it would be difficult to add anything to our knowledge 
of this plant. The opportunity has however been taken here to 
figure some of Binney’s sections, and, at the same time, to point 
out some of the more interesting features in the structure of these 
important types. 
Lyginodendron Oldhamium { Binney). Type specimens. Wood- 
wardian Museum, Cambridge. Binney Collection. Nos. 179 and 
180 (T. S.), No. 181 (R. L. S.), and No. 182 (T. L. S.). 
Locality. Calcareous nodule in the Upper Foot Coal, 15 yds. 
above the Gannister, at Moorside, near Oldham, Lancashire. 
1866. Dadoxylon Oldhamium. Binney, Proc. Lit. and Phil. 
Soc. Manchester, 1866. 
1873. Dictyoxylon Oldhamium. Williamson, Part iv. Phil. 
Trans., 1873. 
1873. Ijyginodendron Oldhamium. Williamson, ibid. 
1890. Lyginodendron Oldhamium. Williamson, Part xvn. 
Phil. Trans., 1890. 
1896. Lyginodendron Oldhamium. Williamson and Scott, 
Part ill. Phil. Trans., 1896. 
1899. Lyginopteris Oldhamiana. Potonie, “ Lehrbuch der 
Pflanzenpaleontologie,” Berlin, p. 170. 
1900. Lyginopteris Oldhamia. Zeiller, “Elements de Paleo- 
botanique.” Text fig. 96, p. 127. 
1900. Lyginodendron Oldhamium. Scott, “ Studies in Fossil 
Botany.” London, p. 308. 
Description of the Specimens. 
Slide 179. Text- figure I. 
A transverse section cut from the upper portion of the speci- 
men, as the position of the leaf-traces, compared with that which 
they occupy in Slide 180, shows. The stem has a diameter of 
L3 cm., and is almost circular. 
The medulla is 15 mm. in diameter, and the tissues are much 
decomposed. Most of the thin-walled elements have disappeared, 
forming a number of spaces, especially near the periphery of the 
medulla, as is clearly seen in the figure. From the occurrence of 
these spaces, Binney concluded that the medulla was similar to 
that of Dadoxylon. It is hardly necessary to add that this 
apparent separation between the medulla and the wood is entirely 
due to bad preservation. Sclerotic nests with thick walls, and 
darkly coloured contents, are numerous in this region. 
