370 



FILICALES 



[CH. 



Johnstrupi^ from the Cretaceous beds (Kome series) of Greenland 

 are very similar to Gnniopteris hymenophylloides. 



Coniopteris quinqueloba (Phillips). Fig. 273. 



This species, originally described by Phillips^ as Sphenopteris 

 quinqueloba, is very similar in habit to G. hymenophylloides, 

 differing chiefly in the smaller size of the leaf and in the 

 narrower ultimate segments. The specimen shown in fig. 273, B, 

 illustrates the form of the sorus and sporangia. 



Fig. 273. 



Coniopteris quinqueloba (Phillips). A, x2; B, considerably en- 

 larged. From drawings supplied by Dr Nathorst. 



Coniopteris arguta (Lind. and Hutt.^). Figs. 274, 275, A. 



The sterile pinnae of this species bear pinnules of a type 

 met with in various species of ferns from different horizons ; 

 the smaller ones are entire and slightly falcate, while on the 

 lower part of a frond the ultimate segments are longer and 

 have a crenulate margin. The fertile pinnae bear pinnules 

 reduced to a midrib with a narrow border, and terminating 

 in a cup-like indusium (fig. 27.5, A). In habit the sterile leaf 

 (fig. 274) of this species is similar to the Jurassic Schizaeaceous 

 fern Klukia exilis. 



Protopteris. 

 Presl* instituted this genus 'for a Lower Cretaceous tree- 



Heer (82) A. PI. ii. fig. 2. 

 Seward (00). 



•' Phillips (75) A. p. 215. 

 ■• Sternberg (38) A. p. 169. 



