Mycoblastus sanguinarius f. leprosus

A rare sorediate form of Mycoblastus sanguinarius. Soralia, when present are rounded, scattered, often few or confined to a few areas on a thallus, sometimes becoming confluent, concolorous with or paler than the thallus, convex, efflorescent.

Morphs with soralia are infrequent and have been treated as M. sanguineus f. leprosus, but nearly always also have abundant apothecia. They are mainly confined to upland Scotland. From current knowledge their separation does not appear to be justified. It is also possible that some sorediate thalli in the west could actually be M. sanguinarioides; this should be checked.