[3] Myriopteris yavapensis is a small fern growing from a long creeping rhizome that is 1 to 3 mm in diameter with bicolored scales.

The ultimate leaf segments are very small, round to oblong and beadlike, with the largest usually 1 to 2 mm in length.

Leaves are abaxially (lower side) glabrous or with a few small scales near the base, and adaxially (upper side) appearing sparsely pubescent but actually nearly glabrous (the few hairs come from the rachis and costa, which also have abundant broader scales).

The costae are green adaxially for most of length, with conspicuous overlapping abaxial scales up to 1 mm wide at their base, and in shape lanceolate, truncate, to cordate, with coarse cilia usually distributed the entire length of scale.

The leaflet edges curl under to form a false indusium that partially covers the sori.