148 ARBER : FOSSIL FLORA OF SOUTH YORKSHIRE COALFIELD. 
1890. Pseudosigillaria dimorpha, Grand'Eury, ibid, Plate IX., 
Figs. 7-8, Plate XXII., Fig. 1. 
1890. Sigillaria-Camp. monostigma, Grand'Eury, ibid, p. 262, 
^ Plate IX., Figs. 4 and 7. 
1890. Sigillaria-Camp. gracilenta, Grand'Eury, ibid, p. 262, 
Plate IX., Fig. 6, Plate XXII., Fig. 1. 
1890. Sigillaria-Camp. lepidodendroides , Grand'Eury, ibid, p. 262, 
Plate IX., Fig. 10. 
1891. Sigillaria camptotcenia, Kidston, Trans. Roy. Soc, Edinb., 
Vol. XXXVI., Part I., p. 86. 
1893. Sigillaria camptotcenia, Kidston, Trans. Roy, Soc. Edinb., 
Vol. XXXVII., Part II., p. 348. 
1894. Sigillaria camptotcenia, Kidston, Trans. Roy. Soc, Edinb., 
Vol. XXXIII., Part II., p. 397. 
1906. Asolanus camptotcenia, Zeiller, Bass, houill. et perm, de 
Blanzy et du Creusot (Etud. Gites. Miner.), p. 157, 
Plate XLI., Fig. 3. 
This plant was included in a new genus, Asolanus, by Wood 
in 1860, though he himself transferred it to Sigillaria a few years 
later. Since then, and until quite recently, it has been generally 
regarded as an example of a non-ribbed Sigillaria (Subsigillarice) 
of the Leiodermarian type, of which it was thought to be one of 
the few British examples. Within the last few years, however, 
the tendency has been to restore it to its original genus Asolanus, 
a view which Zeiller and others have adopted, and to regard its 
affinities, at least provisionally, as more nearly related to 
Lepidodendron, or Bothrodendron, than to Sigillaria. In Asolanus, 
the leaf -scars are arranged spirally, and not in vertical series, and 
the prints seen on the leaf -scars do not agree with those found in 
the case of Sigillaria. In Sigillaria, there is a central print (the 
scar of the leaf -trace) flanked by two large scars, the prints of the 
strands of the parichnos. The leaf-scar of Asolanus bears a 
circular print, within which there may be one or two small, punc- 
tate scars. Decorticated Sigillarias show the large paired, and 
curved scars of the parichnos strands, which are not, however, 
seen in the corresponding impressions of Asolanus, where the scars 
are single and linear. 
