LEPIDOSTROBUS 



183 



on this subject I am indebted to Mr. R. Kidston, 

 F.R.S. 1 



This strobilus is only about 1 cm. in diameter, 

 and was probably not more than 4 cm. in length. 

 In general morphology and structure it is essentially 

 similar to L. oldhamius, but all the parts are on a 

 smaller scale, and the slender stele of the axis has but 

 little pith (see Fig. 72). The sporophylls have the 



Fig. 72. — Lepidostrobits Veltheimianus. Transverse section of cone, through microspore- 

 region. st. t stele of axis; $/•., laminae of sporophylls (only partially shown); sm., 

 microsporangia ; in the two to the left trabeculae are shown. X about 7. S. Coll. 

 400. (G. T. G.) 



same general form as in the previous species (Fig. 74), 

 but the pedicels on which the sporangia are seated 

 are relatively flatter and wider. In some, at least, 

 of the specimens, their arrangement is in alternating 

 verticils. The heterospory is beautifully shown in 

 several specimens ; from the longitudinal sections it is 



1 This Lepidostrobus was described and figured by Williamson in his 

 " Organisation of the Fossil Plants of the Coal-measures," Part iii. 1872, 

 and Part xix. 1893, Phil. Trans. 



