Pleurothallis cardiothallis Rchb.f 1857 SUBGENUS Pleurothallis SECTION Macrophyllae-Fasciculatae Lindl 1859 Photo by © Wiki Orchid Page
Another Color form Photos by © Walter Schug and His MesoAmerican Orchid Page
Another Color Form Colombia Photo courtesy of Jay Pfahl
Another Color Flower Photo courtesy of Daniel Jimenez G. in Costa Rica
Plant Photo courtesy of Dale and Deni Borders.
to
LATE 
THROUGH EARLY
Common Name The Heart Shaped Growth Pleurothallis
Flower Size more than 1/2" [more than 1.2 cm]
This small to medium sized species is found in Mexico, Belize, Costa Rica, Nicaragua, Colombia and Ecuador in wet montane forests from elevations of 300-2900 meters and is a hot to cool growing plant with a rigid, erect ramicaul enveloped by two tight sheaths and carrying a single, apical, cordate, coriaceous leaf that blooms on an apical, short, single flowered inflorescence subtended by a papery sheath holding the flower close to the leaf base and occurs in the late spring through early fall.
CAUTION The first photo, although an alba variety, is absolutely correct to Luer's drawing the others all are lacking in one detail or other.
Synonyms Acronia cardiothallis (Rchb. f.) Luer 2005; Humboldtia cardiothallis (Rchb. f.) Kuntze; Humboltia cardiothallis (Rchb. f.) Kuntze 1891; Pleurothallis acutipetala Schlechter 1912; Pleurothallis costaricensis Schlechter 1917; Pleurothallis schlechteriana Ames 1923; Pleurothallis subulata Rolfe 1892
References W3 Tropicos, Kew Monocot list , IPNI ; Repert. Sp. Nov. Regni. Veg. Beih. 19: 25. Costa Rica Schlechter 1923 as P schlechteriana; Repert. Sp. Nov. Regni. Veg. Beih. 19: 110. Costa Rica Schlechter 1923 as P schlechteriana; Repert. Sp. Nov. Regni. Veg. Beih. 19: 194. Costa Rica Schlechter 1923 as P schlechteriana; Encyclopedia of Cultivated Orchids Hawkes 1965; Las Orquedias De El Salvador Vol 2 Hamer 1974 drawing ok/photo hmm; AOS Bulletin Vol 48 No 5 1979; Las Orquedias de El Salvador Vol 3 Hamer 1981 drawing fide to the second photo; Icones Planetarum Tropicarum plate 1086 Dodson 1984 drawing the first and third photo have an acute deflexed lip apex and does not conform, the second photo is an exact match to this drawing; Icones Pleurothallidinarum Systematics of Pleurothallis Vol 3 Luer 1986; AOS Bulletin Vol 67 No 7 1998 photo; Icones Pleurothallidinarum XXVII Systematics of Dryadella and Acronia Section Macrophyllae-Fasciculatae Luer 2005 drawing as Acronia cardiothallis; Orchid Digest Vol 71 No 3 2007 photo; Orchids of Costa Rica Vol 5 Morales 2009 photo fide;
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