MARATTIACEAE 507 
the long petiole bears five palmately disposed lobes, of broadly lanceolate 
form, with a general similarity of outline to the leaf of the Horse Chestnut 
(Fig. 278, pD). The venation, which is simple in other genera, of the 
Neuropterid, Pecopterid, or Taeniopterid types, is more complex in 
Kaulfussia, approaching that of the Drvzaria-type. 
The roots originate internally close beneath the growing point of the 
stem (Fig. 279): in simple cases there may be one root to each leaf, 
Fic. 275. 
A small plant of Danaea alata. X}. st=stipules. (After Campbell.) 
but in strong plants the roots are more numerous. They take a course 
obliquely downwards through the tissue of the stock, finally issuing as 
robust roots which branch monopodially. 
Among Palaeozoic fossils radially constructed stems of greater length, 
but showing strong analogies with the stems of modern Marattiaceae, 
have long been known under the name of Cawz/opieris, when the external 
surface is seen in the form of impressions; or of Psaroniws when the 
internal structure is preserved. Among other points of similarity which 
they show, the roots may be found traversing the cortex of these stems 
