Lecidea laboriosa is a species of lichen that grows inside solid rock (endolithic), with only the small black disc-like fruiting bodies (apothecia) visible above the rock surface.

[2]: 301 [3] Unlike other members of the genus Lecidea, the apothecia are not lecideine in that they either lack black margins (exciples) or have gray vertically striated margins.

[3] It might be the most common endolithic lichen in California.

[2]: 301 It is similar in appearance to Catillaria lenticularis, Polyspora simplex, and Sarcogyne clavus.

[2]: 301 It is negative to lichen spot tests, K−, P−, C−.