Pleurothallis cardiothallis Rchb.f 1857 SUBGENUS Pleurothallis SECTION Macrophyllae-Fasciculatae Lindl 1859
LCDP Photo by Sierra-Ariza and LANKESTERIANA 22(1) UNA NUEVA ESPECIE DE PLEUROTHALLIS (PLEUROTHALLIDINAE) SUBSECCIÓN MACROPHYLLAE-FASCICULATAE PARA LA REGIÓN ANDINA COLOMBIANA Sierra-Ariza, Rinc.-González & Villanueva 2022
Photo by © Wiki Orchid Page
Photos by © Walter Schug and His MesoAmerican Orchid Page
Photo by © Jay Pfahl
Photo by Daniel Jimenez G. in Costa Rica
Photo by Dale and Deni Borders.
Drawing by Rchb.f
to
LATE 
THROUGH EARLY
Common Name The Heart Shaped Growth Pleurothallis
Flower Size more than 1/2" [more than 1.2 cm]
Found in Mexico, Belize, Costa Rica, Nicaragua, Colombia and Ecuador in wet montane forests from elevations of 300 to 2900 meters as a small to medium sized, hot to cool growing, caespitose epiphyte with a rigid, erect ramicaul enveloped by two tight sheaths and carrying a single, apical, cordate, coriaceous leaf that blooms in the late spring through early fall on an apical, subtended by a papery sheath, short, single flowered inflorescence with a shorter than the pedicel floral bract and holding the flower close to the leaf base.
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; Zosterophyllanthos cardiothallis (Rchb.f.) Szlach. & Kulak 2006
References W3 Tropicos, Kew Monocot list , IPNI ;
* Bot. Zeitung (Berlin) 15: 158. Rchb.f. 1857;
Bull. Misc. Inform. Kew 1892(65-66): 137-138. Rolfe 1892 as P subulata
Bull. Misc. Inform. Kew 1917(2): 80. Rolfe 1917. as P costaricensis;
Schltr., Beih. Bot. Centralbl. 36(2): 395-396. 1918 as P costaricensis 1918;
Sched. Orch. 2: 24. Ames 1923 as P schlechteriana;
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;
Orchids of Guatemala and Belize Ames & Correll 1952;
AOS Bulletin Vol 31 No 8 1962 as P aff cardiothallis photo ok;
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 good match to this drawing;
Icones Pleurothallidinarum Systematics of Pleurothallis Vol 3 Luer 1986;
AOS Bulletin Vol 67 No 7 1998 photo fide;
Guatemala Y Sus Orquideas Behar & Tinschert 1998 photo fide;
Manual de Plantas de Costa Rica Vol 3 Hammel, Grayum, Herrera and Zamora 2003;
Algunas Orquideas de Oaxaca Suarez 2004 photo fide;
Icones Pleurothallidinarum Vol XXVII Syatematics of Dryadella Systematics of Macrophyllae-Fasciculatae Luer 2005drawing as Acronia cardiothallis; Orchids of Mexico Hagsater, Soto, Salazar, Jimenez Lopez & Dressler 2005 photo fide;
Orchid Digest Vol 71 No 3 2007 photo fide; Orchids of Costa Rica Vol 5 Morales 2009 photo fide;
Algunas Orquideas De Mexico Tomo 1 Suarez 2012 photo fide;
Guia de Orquideas de Chiapas Carlos Rommel Beutelspacher Baigts 2013 photo fide;
Orquideas del Valle de Aburra Medellin Colombia Orquidelogia 2014 photo fide;
LANKESTERIANA 17(2) Pupulin 2017 photo/drawing fide;
Diversity of Pleurothallidinae in Guatemala: An Endangered Orchid Subtribe with High Economic and Horticultural Potentials Edgar Mo Mo, Cetzal, Basu and Vega 2017 photo fide; Orchid Genera and Species in Guatemala Archila, Szlachchetko, Chiron, Lipinska, Mystkowska and Bertolini 2018 as Zosterophyllanthis cardiothallis photo fide;
Vanishing Beauty, Native Costa Rican Orchids Vol 2 Lacaena to Pteroglossa Pupulin 2020 photo fide;
Harvard Papers in Botany Vol. 26, No. 1 2021, The Researchgate Website photo/drawing fide; LANKESTERIANA 22(1) UNA NUEVA ESPECIE DE PLEUROTHALLIS (PLEUROTHALLIDINAE) SUBSECCIÓN MACROPHYLLAE-FASCICULATAE PARA LA REGIÓN ANDINA COLOMBIANA Sierra-Ariza, Rinc.-González & Villanueva 2022 LCDP photo fide
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