Diplotomma murorum 2.jpg
Diplotomma murorum, the apothecia appear to be identical to those of D. alboatrum but they occur within thalli of Caloplaca teicholyta. The supposed lichenicolous habit on C. teicholyta seems to be the only distinguishing feature from D. alboatrum. Nordin (1996) in Symb. Bot. upsal. 31: 327-354, synonymised the two species but members of the British Lichen Society continue to record D. murorum separately.