Sanguinotrema wightii also features pore-like (myriotremoid) apothecia with entire margins; Leptotrema-type asci; small, muriform, brown ascospores; and a lack of secondary substances.

The type specimen was collected by Scottich surgeon and taxonomist Robert Wight in Madras (now Chennai), India, and it is him for whom the species is named.

[4] The blood-red crystal clusters in the photobiont layer and medulla are unique within the family, making this species unmistakable and serving as the basis for the generic name Sanguinotrema.

This tribe is characterized by a thick or inflated thallus with a hollow base, columnar clusters of calcium oxalate crystals, and rounded to angular or lobate ascomata.

[3] Sanguinotrema wightii is a common and widespread pantropical species found on tree bark or, more rarely, over bryophytes in seasonally dry lowland forests.