CHARACE^ 183 



Miiller— Bull. Soc. Bot. Geneve, 1881. 

 Johovv — Bot. Zeit., 1881, pp. J2() et seq. 

 Nordstedt— Hedwigia, 1888, p. 181. 

 Allen — Characece of America, 1888. 



FOSSIL CHARACE.^. 



In various strata, commencing with the Cretaceous, remains known 

 as gyroliths are found, sometimes in great abundance, which appear to 

 be the petrified pericarp of the spermocarp of Charace^e. Upwards of 

 forty species have been described, some of them closely resembling 

 existing forms. 



