CALCAREOUS ALGAE OF THE MIDDLE EAST 



si/ fc 



Discs not 

 evolved 



Fig. 16. Reproductive Evolution in Dasycladaceae. i. Idealized endospore dasyclad 

 (typically Palaeozoic), showing sporangia within the stem-cell and simple, sterile 

 branches. No calcification shown : this feature is variable between different known 

 genera. 2. Idealized cladospore dasyclad (typically Mesozoic), showing sporangia 

 within swollen branches, and separate whorls of fertile and sterile branches. No 



