The degree of continuousness on the margins of R. subleptocarpha can be variable, but R. farinacea always has a much greater degree of "discreteness" to its soralia. Likewise, the amount of soredia in teh middle of the blade is variable, but R. subleptocarpha almost always has "a lot", and R. farinacea will have a lot less.
JJ Johnson
2014-08-00
Sat Aug 09 2014 13:14:39 GMT-0700 (PDT)
United States of America, California, 170 Upper Terrace, San Francisco, CA
'soredia in the middle of the blade' - can't tell if soridia on the margins are continuous or discrete.. (suggested distinctions per tom_carlberg on previous observation) If soredia are continuous on edges of blade, then it might be 'Ramalina subleptocarpha' http://www.inaturalist.org/observations/815374