THE CLIFF BRAKES. 
States. The most southern stations are in 
Pennsylvania, Illinois, Iowa and Colorado, 
mostly in cool and elevated regions. It is 
quite remarkable that this thin-fronded 
plant which seems so little adapted to ex- 
tremes of temperature should be found only 
in cold northern countries. It is plentiful on 
the sides of many ravines in Central New 
York especially in the habitats of the hart’s 
tongue. It grows in Northern Asia, also. 
The systematists have had much trouble 
in placing this species satisfactorily. It was 
long known to American botany as Preris 
gracilis, Later it was called Pellea gracilis 
and until recently was known by that name. 
Then it was changed to P. Ste/lert and still 
later placed in another genus as Cryffo- 
gramma Stellert. It is likely that the major- 
ity of botantists will continue to call it 
by the name we have given at the beginning 
of this description. The plant figured was 
collected near Binghamton, N. Y., at an 
altitude of about goo feet. 
The Dense Cliff Brake. 
The dense cliff brake (Pellga densa) prop- 
erly belongs to the northwestern part of 
North America, being found from California 
and Colorado northward to Alaska, but it 
also strays as far east as Mt. Albert in 
Quebec. In this part of its range it is ex- 
tremely rare. Only one other eastern local- 
Pellwa densa. 
Frond, 
Fertile 
