224 BRITISH DES.M I IMAGED. 



r. Distrilnitinii. Germany. (lalicia in Austria. 

 Norway. Sweden. Azores. United States (?). Brazil. 



This is the smallest and rarest species of the genus. It 

 is somewhat smaller than the average forms of T. Irrrix, and 

 the semicells are more attenuated. The cell-wall is nut 

 smooth as described by De Bnry, but is punctate as in all 

 other species of the genus, the punctulations being very 

 delicate and not easily seen. Roy records it from Scotland 

 as "not uncommon on wet rocks," but we find 7'. //rr/.v more 

 usual in such situations. T. mimitux is frequent in the bug- 

 pools in the Outer Hebrides. 



All Wolle's figures of the genus Trtn/ernnrnx are very bad 

 ones. The zygospores figured by him (Desm. U.S. 1884, 

 t. 20, figs. 7-9) do not belong to 7'. inhnitux, but to T. /.rr/x. 



