Pyrrosia rupestris (R.Br.) Ching

Sori occupying up to three-quarters of the abaxial surface of the fertile fronds, irregularly but densely crowded in 1–4 rows on each side of the midrib, slightly confluent in age, but retaining their identity longer than the sori of P. confluens. Fronds markedly dimorphic; sterile fronds frequently almost orbicular, 1–2.5 cm (sometimes up to 8cm) long including the stipes, 0.3–1.4 cm broad, often shorter than the fertile fronds. Scales of the rhizome squarrose, entire, thin-textured, pale-ferruginous. Widespread. RF. Usually covering rocks. Rock Felt Fern