312 DIPTERIDACEAE [ch. 



it is evident that in venation Dipteris bears characters of advance, and that 

 these are more prominent in D. conjiigata than in D. Lobbiana. This 

 harmonises with the comparison of the lamina as a whole, and particularl\- 

 with the advanced webbing. 



T^y E 



Fig. 568. Dipteris^mwi. A-C, D. cotijiigata [\^7:,\\\'i.)^€\\\\\. .-:/= leaf of a mature plant. i)' = habit 

 of a young plant. C = part of a fertile leaf with venation and son. i5 = sporangia and pavaphyses 

 enlarged. E^D. Lobbiatia (Hook.) Moore. Part of a fertile segment with venation and son. 

 {A, C, D after Kunze. B, E after Diels.) 



The axis and the bases of the leaves of Dipteris are covered with dense 



brown bristles, which widen conically downwards. They are not actually 



flattened, though the insertion may be oval as seen in transverse section. 



