314 



DIPTERIDACEAE 



[CH. 



s are soft and 



the filamentous hairs of Matonia: but in both the basal ce 

 thin-walled, while the distal end is indurated and pointed. 



As in Gleicheiiia and Matonia, so in D. Lobbiana the sori are disposed in 

 regular linear series on either side of the midrib in the narrow leaf-lobes, 

 each occupying the centre of one of the stronger-marked areolae (Fig. 571). 

 \n D. qninqiiefurcata the segments are broader than in D. Lobbiana, and the 



Fig. 571. Part of a fertile segment 

 of Diptcris Lobbiana. The sori 

 fonii a simple row on one side of 

 the midrib : on the other they have 

 been removed, and it is seen that 

 there is here no special vascular 

 supply to the receptacle, only a 

 rather dense plexus of the reticu- 

 late veins. ( x 8.) 



Fig- 57-- Dipteris qiiuujitefiircata 

 Baker. Bifurcating segment similar 

 in form to D. Lobbiana, but of greater 

 width, while the sori spread over a 

 larger surface, with many suggestions 

 of fission. Nevertheless at the narrower 

 base they appear in two lateral rows 

 as in D. Lobbiana. (Natural size.) 

 (After Maxwell.) 



areolae within the larger veins on either side of the midrib are larger, and 

 contain more sori. These illustrate various degrees of fission, and they thus 

 become spread over the enlarging area (Fig. 572). D. Wallichii appears to 

 occupy a middle position between these species and the large D. conjugata, 

 for it is described as having the ultimate segments linear in form, and the 

 sori as being similar to those of D. conjugata but more numerous than in 



