SUBGENUS Arthrosia Luer 1986

Characterized by the tranverse callus across the base of the lip that articulates with a transverse cavity across the base of the column foot. The apex of the column is toothed or lacerate and is partially covering the anther. The caespitose to repent ramicauls may be round to laterally compressed to triquetrous above and carry sessile leaves and racemose inflorescence without an annulus.

1. Pleurothallis albiflora Barb.Rodr. 1891 Brazil

2. Pleurothallis auriculata Lindl. 1836 Bolivia

3. Pleurothallis caldensis Hoehne & Schltr. 1926 Brazil

4. Pleurothallis capillaris Lindl. 1835 Leeward Islands, the Windward Islands, Venezuela, Colombia, Ecuador, Bolivia and Brazil

5. Pleurothallis duartei Hoehne 1929 Brazil

6. Pleurothallis freyi (Luer) comb. novo. Pfahl 2013

7. Pleurothallis gracilis Barb.Rodr. 1877 Brazil

8. Pleurothallis heliconiscapa Hoehne 1929 Brazil

9. Pleurothallis hygrophila Barb.Rodr. 1877 Brazil

10. Pleurothallis muscosa Barb.Rodr. 1877 Brazil and Argentina

11. Pleurothallis myrticola Barb.Rodr. 1877 Brazil

12. Pleurothallis parahybunensis (Barb.Rodr.) Luer 1981 Brazil

13. Pleurothallis purpureoviolacea Cogn. 1896 Brazil

14. Pleurothallis sulphurea Barb. Rodr. 1881 Brazil