148 



THE MARATTIALES 



of his figures, where there is no forking of the mid-vein, the lateral veins seem to 

 follow the margin of the leaf and rejoin the central vein, thus inclosing two large 

 areoles like those found in the cotyledon of Kaulfussia; no mention of this, however, 

 is made in the text. D. jamaicensis (fig. 125, A) shows a very similar form and vena- 



A. Four young sporophytes still attached to the gametophyte of Dantra jamaicensis. X2. 



B. Young cotyledon of D. elliptica. X15. 



C. An older cotyledon of D. eUipiica. X3.5. 



tion, but the cotyledon is larger and there is sometimes a forking of the lateral veins. 

 In this species also there may sometimes be found a fan-shaped lamina with true 

 dichotomous venation like that of Marattia, but as I had little material of this 

 species I can not say how common this form is. It is probable that an examination 



Fig. lib. 



A. Young sporophyte of D. jamaicensis^ with four leaves, 



slightly enlarged, i, the cotyledon. 



B. Base of the fourth leaf, showing stipules, st, and peltate 



scale, sc. Xzo. 



of a large series of young plants would show examples of the same type of cotyledon 

 as in the other species. The cotyledon of D. elliptica (fig. 125, B, C) is of much the 

 same form as that of D. jamaicensis, but the cotyledon is larger as a rule and the 

 venation may be more complex, although conforming to the same general type. 



