80 CASH & HICK: FLORA OF THE LOWER COAL MEASURES 
Lyginodendron. 
The stems and bark of this genus, which rejoices in the 
synonyms of Dadoxylon and Dictyoxylon, has been found at 
Sunny Bank and Bank Top Pits, at Sugden Pit, and at 
Elland. The species is L. Oldhamium. In transverse section 
the stem exhibits a circle of plates of fibrous tissue, arranged 
somewhat like the Eoman figures on the face of a church 
clock. 
Diplyoxylon. Bank Top Pit and Elland. 
Kaloxijlon Hookeri. 
A single specimen of this singular form has been found by 
Mr. Binns in the Halifax Hard Bed. 
Fern Stems. 
Professor Williamson has adopted the plan of referring the 
fern stems of the Coal Measures provisionally to the genus 
Bachiojrferis; thus, "by adopting this plan we avoid burden- 
ing science with a number of meaningless genera, based upon 
characters which have little, if any, generic value, and which 
only possess even specific ones under peculiar limitations, 
such limitations arising from the variations which a single 
petiole exhibits according to the portion of it from which a 
section is made." Following this method, we have to record 
the following species from our locality : — 
R Oldhamia. Elland. 
R. duplex. 
R. Cylindrica. Elland. 
(This peculiar form was first discovered by 
Mr. Binns.) 
R aspera. 
E. (Zygopteris) Lacattii. 
