Pleurothallis callosa Diaz & Pupulin 2021 SUBGENUS Pleurothallis SECTION Macrophyllae-Fasciculatae Lindl 1859

LCDP Photo by M Diaz and Harvard Papers in Botany Vol. 26, No. 1 2021, The Researchgate Website


Common Name The The Callose Pleurothallis [refers tothe 2 prominent calli at the base of the lip]

Flower Size .8" [2 cm]

Found in Cartago province of Costa Rica in wet lower montane rain forest along the Caribbean slopes of the Cordillera Volcánica Central at elevations around 1200 meters as a small sized, cool growing epiphtye with a slender, grass green ramicaul provided with a tubular, truncate sheath at the base and a tubular, tightly adpressed, truncate sheath below the middle and carrying a single, horizontal at the apex of the ramicaul, becoming subpendent with age, thinly coriaceous, matte grass green, sessile, narrowly ovate, acuminate, cordate below into the base leaf that blooms in the later spring on a peduncle terete, slender, about .52" [1.3 cm] long, arising through a prostrate, brown, evanescent spathe, single flowered inflorescence.

"The species is differentiated from other species of the P. cardiothallis group by the solid dark-red flowers and the prominent calli on the basal half of the conduplicate lip. Pleurothallis callosa has the general, peltate outline of the lip that can be found in several of the pecies close to P. cardiothallis, but it is comparatively larger and provided with 2 large, elliptic, rounded calli at the base that embrace the area of the glenion. The concolorous, darkred flower is superficially similar to that of P. scotinantha, but in the latter the lip is triangular, it is ecallose, and the flower is better described as dark purple in color instead of red." Pupulin etal 2021


References W3 Tropicos, Kew Monocot list , IPNI ; * Harvard Papers in Botany Vol. 26, No. 1 2021, The Researchgate Website photo/drawing fide;