288 



DESCRIPTIVE CATALOGUE 



there to broad funnel-shaped ends (text-fig. 88, a.). L r ,,i- 

 seriate rays are innumerable, lying generally only two, or even 

 one, wood-fibre series distant. The cells composing the ravs 

 are all rather thick-walled and pitted, their shape and character 

 being very various, and the end-cells of the multiseriate rays 

 sometimes being extremely elongated vertically. Cambium is 

 preserved in places, and is quite normal. Phloem, 1 5 mm. 

 thick, is preserved and is composed of irregularly alternating 

 masses of stone and soft cells (text-fig. 88). A little very much 

 crushed cortex is preserved, in which no true cork is identifiable, 

 though there is a suggestion of its presence. 



Text-fig. 90. Afrfiftna radiatn, Stopes. Transverse section of a small 

 part of the wood enlarged, showing the' small vessels little larger 

 than the wood-fibres. At a., a fibre-tracheid shows the pit-canal of a 

 bordered pit in each of its walls, m., the thickened and pitted cells of 

 the medullary ray. X nearly 500. 



DETAILS or ELEMENTS. The pith-cells appear to have been 

 uniform, roughly circular, averaging about 30-40 /x, with some 

 larger cells toward the centre. The smaller peripheral elements 

 merge imperceptibly into the bundle-sheaths of primary wood. 

 The primary wood-dements in transverse section consist of small 



