The dorsum is tan and has three large dark consecutive blotches that may be well-defined but also show a varying degree fading, depending on a specimen.

There is a broad black lateral band that runs from the tip of the snout through the eye and then descends towards venter at the mid-body.

The arms and legs are dorsally tan and have some thin, broken black bands.

[2] Cardioglossa alsco is found in montane gallery forests at elevations of 1,700–2,100 m (5,600–6,900 ft) above sea level.

[1] The types were found under large stones around shallow pools, adjacent to a creek running in a gallery forest.