OF LOWER GREEtfSAND PLANTS. 273 



and probably more, than 2'5 cm. in diameter when alive. A 

 branching woody stem with primary wood in a ring without 

 well-marked primary bundles. The wood uniform and compact 

 in structure, with vessels uniformly scattered, singly or in pairs, 

 through the ground-mass of thick-walled fibres. Vessels aver- 

 aging about 25-70 /j. in diameter, with thick walls. Medullary 

 rays inconspicuous, all either uniseriate or only two or three 

 cells wide. Cells of rays rectangular, nearly square, thickened, 

 and pitted. 



HORIZON. Lower Greensand. 



LOCALITY. Woburn Sands, Bedfordshire. 



Text-fig. 82. Sabulia Scott it, Slopes. Transverse section of the stein 

 showing the growth-rings, the uniform distribution of the vessels", and 

 the two piths due to branching, w., a healed-over wound ; /., a 

 "knot" due to another branch. X nearly 3 diameters. After 

 Stopes. No. V. 5654 a. 



TYPE. Block V. 5654, and slides V. 5654 , ?>, c, <7, e cut 

 from it in 1911 ; British Museum (Nat. Hist.). 



GENERAL DESCRIPTION. The species is founded on a single 

 specimen, a short length of a decorticated branch now 2-5 x 2 cm. 

 in diameter. Externally the woody texture shows very clearly, 

 and is free from matrix. At one end the branch is broken across 

 at an angle and weathered, so thai the growth-rings of the wood 



T 



