C HA RACEME 183 



Miiller Bull. Soc. Bot. Geneve, 1881. 

 Johow Bot. Zeit., 1881, pp. 729 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 Characeae. Upwards of 

 forty species have been described, some of them closely resembling 

 existing forms. 



