The type specimen of this hyphomycetes fungus was found growing on dead branches of Rourea minor in Hainan Bawangling National Nature Reserve.

[2] Quadracaea roureae forms colonies on natural substrates that are spread out, brown in color, and covered in fine hairs.

It consists of branched, septate (segmented) hyphae that are pale brown and smooth-walled, measuring 1–2 micrometres (μm) in thickness.

These cells are polyblastic, meaning they produce multiple spores, and are terminal (at the end of the structure) but can become intercalary (inserted along the length).

The apical cell of each conidial arm produces blastic (budding) conidia that are fusiform (spindle-shaped), slightly curved, aseptate (without septa), and hyaline (glassy).