CHARACE^E 183 



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

 Johow — Bot. Zeit., 1881, pp. "jzgetseq. 

 Nordstedt— Hedwigia, 1888, p. 181. 

 Allen — Characeae of America, 1888. 



FOSSIL CHARACE^. 



In various strata, commencing with tHe Cretaceous, remains known 

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

 be the petrified pericarp pf the spermocarp of Characese. Upwards of 

 forty species have been described, some of them closely resembling 

 existing forms. 



