LEPIDOSTROBUS 



i»5 



about .02 mm. in diameter. The megaspores are 

 relatively of enormous dimensions, so that they are 

 easily visible .to the naked eye. Their mean diameter 



OK 



Fig. 74. — Lepidostrobus Veltkeimianus. Longitudinal section of cone, showing micro- 

 sporangia above and megasporangia below, ax, axis of cone, showing stele (zy) and 

 leaf-traces, passing out to sporophylls, br ; mi, microsporangia ; ma, megasporangia, 

 containing a few spinose megaspores. X about 4. S. Coll. 1008. (G. T. G.) 



is at least .8 mm., quite forty times that of the micro- 

 spores (see Fig. 75, C). The number of megaspores in 

 each sporangium was small, certainly not more than 

 sixteen, and perhaps as few as eight (cf. Figs. 73 and 



