CINGULARIA 



6 9 



been the points of attachment of the sporangia, as the 

 latter are occasionally found in situ. Each of the 

 sporangiophores thus bore four sporangia on its lower 

 surface (Fig. 29). The sporangia were of approximately 

 spherical form, and remarkably large, averaging 5 mm. 

 in diameter, which is five times the size of the sporangia 

 of Calamostachys Binneyana. The number of bracts in 



Fig. 29. — Cingularia typica. Enlarged diagram of a verticil of the cone, showing the 

 connate bracts (b) above, and the strap-shaped sporangiophores (r) below, bearing 

 the sporangia (s). The small figures show two sporangiophores, that on the left see n 

 from above, and that on the right from below. In the middle a sporangium. After 

 Weiss. 



a whorl seems to have been equal to that of the 

 sporangiophores. The great peculiarity of Cingularia 

 consists in the fact that the sporangiophores lie 

 immediately below the sterile bracts of each whorl, 

 instead of immediately above them, as in the last type. 

 This is different from anything we are accustomed to 

 find among other Pteridophyta. In the absence of 

 better evidence than we at present possess, it is 

 impossible to draw any decisive conclusions as to the 



