i8 Arber, Fossil Plants from the Ardwick Series. 



difference of opinion as to whether P. ahbreviata Brong. 

 should be regarded as a species distinct from P. Miltoni 

 (Artis). It is, however, believed that no good characters 

 exist for separating these plants. A discussion on this 

 subject will be found in Mr. Kidston's memoir^ on the 

 Fossil Flora of the Somerset Coalfield. P. Miltoni is a 

 very abundant and characteristic plant in the Ardwick 

 Series. A frond of this species is figured on Plate I., 

 Fig. 4. 



Mariopteris Zeiller 1879. 

 Bull. Soc. geol. France. Sen 3, Vol. vii., p. 92. 

 Mariopteris imtricata (Schl.) ? 



Sedgwick Mus. Camb., Carb. Plant Coll., No. 385 

 and 599. 

 Mariopteris mjiricata. 



1886. Kidston, Cat. PalcBoz. Plants Brit. Mtis., p. 109. 

 1886-8. Zeiller, Bassin Jiouill. de Valenciennes, p. 173, 

 PI. XX., PI. XXL, PI. XXIL, Figs, 1-2 ; PL XXIII 

 Pecopteris imiricata. 



1828. Brongniart, Hist. Veget.foss., p. 352, PI. XCV., 

 Figs. 3-4 ; PI. XCVII. 



Mariopteris viiiricata is one of the commonest of 

 Coal-measure plants, and occurs in all divisions of the 

 Upper Carboniferous, though less abundantly in the 

 Upper Coal Measures. 



LYCOPODIALES. 



Lepidodendron Sternberg 1820. 

 Versuch. Darstell. Flora der Vorivelt, I., fass. i, p. 23. 



I. Lepidodendron lycopodioides Sternb. 

 Sedgwick Mus. Camb., Carb. Plant Coll., No. 11 23, 

 958, 599- 



1 Kidston ('88), p. 374. 



