15. Prescottia spiranthophylla Barb.Rodr.,

Gen. Sp. Orchid.1: 177. 1877.

Rupicolous herb. Leaves 6, sessile, distributed along the caulome; blade green, immaculate, subchartaceous, flat, convolute, linear, obscurely parallel-veined, acute apex. Inflorescence in raceme, terminal, multiflowered, congested, glabrous. Flowers non-resupinate, ecalcarate, overlapping; sepals and petals green, immaculate; lip green, entire.

Distribution: Restricted to Brazil (only in the state of Rio de Janeiro) and endemic to the Atlantic Forest domain, occurring exclusively on rock outcrops (Meneguzzo c2020b).

Specimen examined: 22º57’31’’ S, 43º10’47’’ W, 9 Nov 2017 (fl), R. Silva s.n. (RFA 43323) .