Diaphananthe bidens (Afzel. ex Sw.) Schltr. 1914 Photo courtesy of Guy Ramette Vovan and His Orchids Of Gabon Website

To 
Common Name The Two Toothed Diaphananthe
Flower Size .6" [1.5 cm]
Found from Central to west Africa in rainforests on tree trunks and large branches at elevations of 350 to 1300 meters as a medium sized pendant, warm to cool growing epiphyte with pendant, elongate stems carrying numerous, distichous, ovate or elliptic, unequally and acutely bilobed apically leaves that blooms in the fall on a pendant, many [to 25] flowered, 9" [22 cm] long, racemose inflorescence.
Synonyms Angorchis ashantensis (Lindl.) Kuntze 1891; Angorchis monodon (Lindl.) Kuntze 1891; Angraecum ashantense Lindl. 1843; Angraecum bakeri Kraenzl. 1889; Angraecum bidens (Afzel. ex Sw.) Rendle 1913; Angraecum monodon Lindl. 1851; Angraecum subfalcifolium De Wild. 1916; Diaphananthe ashantensis (Lindl.) Schltr. 1918; Diaphananthe monodon (Lindl.) Schltr. 1918; Diaphananthe mystacidioides (Kraenzl.) Schltr. 1918; Diaphananthe producta (Kraenzl.) Schltr. 1918; Diaphananthe subfalcifolia (De Wild.) Schltr. 1918 ; *Limodorum bidens Afzel. ex Sw. 1805; Listrostachys ashantensis (Lindl.) Rchb. f. 1864; Listrostachys bakeri (Kraenzl.) T.Durand & Schinz 1894; Listrostachys bidens (Afzel. ex Sw.) Rolfe 1898; Listrostachys longissima Kraenzl. 1912; Listrostachys monodon (Lindl.) Rchb.f. 1864; Listrostachys mystacidioides Kraenzl. 1900; Mystacidium duemmerianum Kraenzl. 1929; Mystacidium productum Kraenzl. 1895
References W3 Tropicos, Kew Monocot list , IPNI ; Orchids of the Central African Republic - A Provisional Checklist Cribb & Fay 1987;Angraecoid Orchids Stewart, Hermans, Campbell 2006