Thallus dark ashy-grey, granulate-verrucose, diffract (0.3-0.5 millim. thick), subdispersed throughout; apothecia black, plane, minute margin (0.5 millim. or less wide), dark within; spores 8, dark brown/grayish-brown, ellipsoid, 1-septate, 0.010-17 millim. long, 0.006-9 millim. thick; paraphyses almost moderately-sized, soft, clavate, dark brown/grayish-brown; hypothecium dark brown/grayish-brown.  Iodine hymenial gelatin becoming blue, then wine becoming yellow or yellow-red.

Above granite rock, in the preeminent La Roche mountains in Haute-Vienne (Lamy), mixed with Sirosiphone saxicola.

In general appearance resembling L. coniope, but thallus color, other, etc. and placed nin true affinity near L. badia Flot. Spermogonia not seen to be properly developed.