The fingers and toes have weakly to moderately enlarged discs but no lateral fringes nor webbing.

The ventral surfaces are cream, with dense, fine grey mottling on the throat.

[3] Yunganastes bisignatus inhabits tropical moist montane forests at elevations of 1,850–2,700 m (6,070–8,860 ft) above sea level.

[1] Males call from low positions (0.3–0.6 m (1–2 ft) above the ground) on tree trunks and bushes at night, and provided that weather is suitably foggy and rainy, during the day.

[3] Yunganastes bisignatus is abundant at its type locality but its range is small and it is threatened by habitat loss.