5° 



STUDIES IN FOSSIL BOTANY 



shall see, the fossil forms considerably disturb current 

 morphological ideas. Secondly, there is the Palaeo- 

 sfachya type, distinguished by the fact that the 

 sporangiophores are not inserted midway between the 

 whorls of sterile bracts, but immediately above each 

 verticil of bracts, and, as it were, in its axil (see 



sm. 



Fig. ij.—Calamostachjs Binneyana. Radial section of part of cone, showing four whorls 

 of bracts (<V) with the sporangiophores (s/>) between them, the peltate part not 

 shown, sm, sporangia, x S. Will. Coll. 1022. (G. T. G.) 



Fig. 24, A, p. 61). The third type is one about which 

 we do not know so much as we should like, because the 

 remains are not preserved with structure, but only as 

 impressions. This is the Cingularia type, which is 

 just the reverse of that of Palaeostachya, for in Cingu- 

 laria the sporangiophores are inserted immediately 

 below the bracts, instead of immediately above them 

 (see Figs. 28 and 29, pp. 6S and 69). Fourthly, we 



