OF LOWEU GREENSAND PLANTS. 187 



round, and standing one vertically above the other. Besin- 

 parenchyma abundant, scattered throughout the wood ; cross- 

 walls rectangular. 



Species founded on small branches, about 1'3 era. in diameter 

 and about nine years old, with both pith and cortex. 



HORIZON. Kentish Hag, Lower Greensand. 



LOCALITY. Iguanodon Quarry, Maidstone. 



TYPE. Small branches, nos. V. 13208 and V. 13208 a-e, 

 slides cut from it ; in the British Museum (Nat. Hist.), part of 

 the specimen (Xo. 15) in the Maidstone Museum. 



DESCRIPTION. The type-specimen in the Maidstono Museum 

 (No. 15) consists of a long piece of a small twig about 1*3 cm. 

 in diameter, of which about 10 cm. in two pieces was presented 

 to the British Museum and sections from it were cut. The 

 twig is interesting as being the only Conifer among the Lower 

 Greensand specimens on which I have worked which shows part 

 of its cortex. The phloem and cortex are both partly preserved 

 outside the wood, and in the cortex are large resin-passages 

 (PI. XVI, fig. 2). The pith is also present, and there are 8 or 

 9 very faintly marked annual rings in the wood, so that we are 

 clearly dealing with a twig about 9 years old. It will bo 

 observed in the other woods described, that the ago and complete 

 size of the material were very uncertain. The twig must have 

 been broken from the tree and preserved in the late summer, 

 for the last tracheid or two before the cambium begins show 

 tangential pits, which are usually only developed in the late 

 summer and " autumn " wood. 



TOPOGRAPHY OF THE STEM. The pith is about 1 mm. in 

 diameter ; it is a little crushed, but was probably roughly 

 circular, with a crenulaied outline due to the bays of primary 

 wood. It is composed of large roundish elements, and I 

 am uncertain whether or not there are stone-cells among 

 them (PI. XVI, fig. 1, p.) in the type, though they are clear 

 in the second specimen (text-fig. 55). The primary ivood 

 projects sharply into the pith in 20 or more rather irregular 

 bundles (PI. XVI, fig. 1, p.x.\ The secondary wood con- 

 sists of close-grained uniform tracheids, in which the rings 

 of growth are very faintly marked. The compression of the 

 autumn tracheids is slight indeed, so slight as to be barely 

 recognisable or measurable in some cases though the walls 



