The
thallus of
Biatora kalbii is made of small round to elongated, convex green squamules (scales) measuring 0.1–0.3 mm in diameter. Some scales are arranged so that they are discrete, while others may overlap; all are attached closely to the
substrate.
Isidia are spherical; they lengthen by budding. The
prothallus is pale and thin.
Apothecia (sexual reproductive structures) are common in
Biatora kalbii; they are circular with a pale to dark brown disc that is either flat or slightly convex, and a margin around the disc. The
ascospores are
ellipsoid to short-fusiform (tapering on both ends).
Pycnidia are common on the lichen surface; they appear tan-coloured spots with orange to brown
ostioles immersed in the thallus. The pycnidia produce straight, rod-shaped
conidia that measure 9 by 1
μm. The lichen does not produce any
secondary chemicals that could be detected with standard
spot tests. ==Distribution==