R. subleptocarpha has marginal soralia that tend to run together so that much of the margin appears sorediate. R. fraxinea does not have soredia; apothecia may or may not be present
Liam O'Brien
2016-05-00
Sat May 21 2016 09:55:06 GMT-0700 (PDT)
United States of America, California, Candlestick Point State Rec Area, San Francisco, CA, US