1908] Fernald,— Rumex salicifolius 17 
Agrimoniae DC., now placed in the genus Pucciniastrum, I kept the 
numerous collections on Potentilla next to that species but it was not 
until a few years ago that I was successful in finding the teleutospores 
which are not abundant and form small reddish brown spots on the 
leaves and stipules. The specimen in Fungi Rossiae has only uredo- 
sori but they agree with the fungus on Potentilla. Probably the 
species is common wherever Potentilla tridentata occurs. 
CAMBRIDGE, MASSACHUSETTS. 
‘THE REPRESENTATIVES OF RUMEX SALICIFOLIUS IN 
EASTERN AMERICA. 
M. І. FERNALD. 
IX his revisions of the North American species of Rumex, Professor 
"Trelease * placed together as R. salicifolius a vast amount of material 
with the broad range: ''Arctic America across to Alaska, south to 
New Hampshire, the Great Lakes, and in the mountains to southern 
California and Mexico, where it closely approaches А. Mexicanus.” 
Then, after referring to certain variations of the species as thus inter- 
preted, the author says: “It may be that these forms will bear sepa- 
ration, even from the Old World type; but the (frequently young) 
specimens in herbaria show as many intermediate forms and admit 
of so poor a geographical delimitation, that I cannot find good 
grounds for recognizing more than a single species." 
“A more zigzag plant with broad elliptical rather firm leaves (3 X 8 
cm.) and one valve almost covered by the very large callosity (1.5 to 
2 X 3 to 4 mm.), the other two naked, occurs from Sta. Cruz Moun- 
tains... . Sta. Lucia Mountains. ... and about San Francisco, Cal... .. 
Others may consider this to be clearly distinct, but I leave it here for 
the present." 
Students of the flora of Western America have recently been in- 
clined to recognize in the aggregate Rumex salicifolius a number of 
! Trelease, Third Ann. Rep. Mo. Bot. Gard. 87 (1892). 
