Date de publication : Fol. Orchid., 9(Pleurothallis): 15. 1859 [05/1859, fide TL-2, 4658].

Description originale : 76. P[leurothallis] exasperata; folio angusto lanceolato caule duplo breviore vaginis transverse scaberrimis, sepali 3 petalisque acuminatis aequalibus, labello ..., ovarii costis 3 asperrimis tribusque scabris - Venezuela, Fendler 1490. h. s. sp. - Much like the last [Pleurothallis ceratothallis Rchb.f. 1854] but far more scabrous. Even the pedicels and bracts are beset with dark hard hairs. My flowers are past, and the lip has dropped from them.

Type : Venezuela, Aragua, pr. Colonia Továr, 16/10/1854, A. Fendler 1490 (HT: K000820790 [ex hb. Lindl.; sur Global plants]; IT: GH00074240, K000079562 [ex hb. Hook.; sur Global plants]).