Pomatocalpa diffusum Breda 1830
Photo by Nik Fahmi Vortex Orchid Pages
to 
Common Name The Diffuse Pomatocalpa
Flower Size 1/3" [8mm]
Found in Malaysia, Sumatra and Java on coral rocks, strand vegetation, secondary forests and mixed dipterocarp forests at elevations of sea-level to 800 meters as a miniature to small sized, hot to warm growing, monopodial epiphyte, lithophyte or terrestrial in grasslands and scrub with stout stems carrying oblong, glossy, coriaceous, tough, shortly and unevenly bilobed apically leaves and blooms in the summer and fall on an axillary, erect, terete, 6 to 16" [15 to 40 cm] long, racemose inflorescence with shortly triangular, acute, concave floral bracts.
This orchid has been known as P latifolia forever but as you can see P diffusum takes precedence as it was published in 1830 and Lindley's publication of Cleisostoma latifolia was in 1840.
Synonyms Cleisostoma cumingii Rchb.f. 1856; Cleisostoma latifolium Lindl. 1840; Pomatocalpa hortense (Ridl.) J.J.Sm 1912; Pomatocalpa latifolia [Lindley]J.J.Smith 1912; Saccolabium hortense Ridl. 870; Saccolabium latifolium (Lindl.) Schltr. 1905; Sarcanthus cumingii (Rchb.f.) J.J.Sm. 1912
References W3 Tropicos, Kew Monocot list , IPNI ; Die Orchideen Von Java J.J.Sm. 1905 as Cleisostoma latifolium; Die Orchideen Von Java Figuren Atlas J.J.Smith 1908 as Pomatocalpa latifolia drawing fide; Flora of Malaya Vol 1 Holttum 1957 as P latifolium; The Orchids of Thailand Seidenfaden & Smitinand 1964 as P latifolia drawing fide; Orchidiana Philipiniana Vol 1 Valmayor 1984 as P latifolia; Rudolf Schlechter Die Orchideen Band 1B lieferung 21 1165 - 1328 Brieger 1988 as P latifolia drawing ok; Opera Botanica #95 Seidenfaden 1988 as P latifolia drawing/photo good; Orchids of Java Comber 1990 as P latifolia photo fide; The Orchids of Penninsular Malaysia and Singapore Seidenfaden & Wood 1992 drawing fide; A Checklist of the Orchids of Borneo Wood & Cribb 1994 as P latifolia; Orchids of Sumatra Comber 2001 photo ok as P latifolia; Orchids of Sarawak Beaman, Wood & Beaman etal 2001; Lindleyana Vol 17 No 1 2002; A field Guide to the Wild Orchids of Thailand Vaddhanaphuti 2005 as P latifolia photo fide; Orchids of Penninsular Malaysia Ong, O'Byrne, Yong & Saw 2011 photo fide; A to Z of South East Asian Orchid Species Vol 2 O'Byrne 2011 photo fide
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