ii6 



MARATTIACEAE 



[CH. 



existent in Palaeozoic times, and that it was then represented both by types 

 having separate sporangia as in Angiopteris, and also by synangial types as 

 in Marattia or CJiristensenia. Both the ancient and the modern representatives 

 of thesorus are strictly circumscribed. But thoseof the Palaeozoic Age appear 



Fig. 408. Dauaeopsk fecit nda Halie, trom the Rhaetic coal mines of Billesholm, after Halle. 

 A, a fertile pinna. (Nat. size.) B, sporangia partly opened. ( x 12.) C, ditto. ( x 25.) 



to have been for the most part circular, with their few sporangia forming a 

 rosette: and this goes with the narrow Pecopterid-type of pinnule. The sori 

 borne on these compare in the number and disposition of their sporangia 



