Hymenium 165- 175 µm, colourless. Epithecium ca. 20 µm, of the same colour with hypothecium. Paraphyses 1.3-1.5 um simple or branched, the tips not thickened. Asci 140- 155 X19-22 µm, c1avate or saccate-cylindrical. Spores 50-80(100) per ascus, 4.6-6.4 X 4.4-5.0 µm, globose, rarely oblong--7.7 X 3.3-4.4 µm. Thallus K-, P-, C-. Hymenium IKI+ blue (paraphyses and ascal walls), K.
Biatorella contigua may be most closer to Biatorella tiroliensis H. Magn. (the material is not seen). B. tiroliensis is a very rare Alpine species, only the type locality is known from the Tirol Alps (Magnusson, 1936). B. contigua is also a very inconspicuous lichen, which is easy to overlook.