RADSTOCK SERIES OF THE SOMERSET AND BRISTOL COAL FIELD. 399 



Leaves long, grass-like. 



Remarks. — Not common. The width of the ribs varies much according to 

 the age of the specimen. 



On some old stems, which, however, may belong to Sig. reniformis (as these 

 two species cannot be clearly distinguished when decorticated), the distance 

 apart of the vertical rows of leaf-scars was as much as 4f inches. The example 

 from which this measurement was taken might be referred to Sig. catenulata 

 or Sig. alternans. 



Localities : — Radstock ; Braysdown Colliery. 



Sigillaria reniformis, Brongniart. 



Sigillaria reniformis, Brongt., Hist. d. veget. foss., p. 470, pi. cxlii. 



Sigillaria reniformis, Lesqx., Coal Flora of Pennsyl., p. 501, pi. lxx. figs. 5-9. 



Sigillaria reniformis, Sauveur, Veget. foss. de la Belgique, pi. 1. fig. 1. 



Sigillaria reniformis, Zeiller, Flore foss. du Bassin houil. de Valenciennes, pi. lxxxiv. figs. 4-6. 



Remarks. — Rare. I have observed at several localities large decorticated 

 stems with long geminate cicatricules ( = Sig. alternans). It is, however, 

 unsatisfactory to refer all these specimens to Sig. reniformis, as Sig. laevigata 

 and probably other species have similar large cicatricules on decorticated stems 

 of old individuals. 



Locality : — Radstock. 



var. Radstockensis, Kidston. 

 Plate XXVII. fig. 6. 



Description. — Stem furrowed, furrows straight, wide, longitudinally striated ;: 

 leaf-scars close and placed on slightly raised square platforms; scars much 

 broader than long, hexagonal, upper margin emarginate, lower margin rounded, 

 lateral angles prominent ; cicatricules situated above the centre of scar, the two 

 lateral oval, the central double, transverse. Two short straight lines extend 

 from the lateral angles, and two from the rounded angles of the lower boundary 

 line of the scar, which divide the lower half of the platform on which the leaf- 

 scar is situated into one equal and two unequal compartments. About midway 

 between the leaf-scars is a transverse furrow. Decorticated stem striated. 



Remarks. — The only specimen I have seen of this variety of Sig. reniformis 

 is that figured, and is in the collection of Mr J. M'Murtrie, Radstock. It 

 differs from the type in the presence of the slightly raised square platforms 

 on which the scars sit, and in the arrangement of the lines that extend from 

 the leaf-scars. On the decorticated stem the cicatricules are oblong-geminate, 

 as in Sig. reniformis. 



Locality : — Radstock. 



VOL. XXXIII. PART IT. * 3 N 



