
The color of Bulbophyllum corolliferum J.J.Sm. 1917 may range from pale pink to dark red. Usually the flowers take an angle of around 45 degrees to the umbel plane. Usually, the umbel of this species is not completely round.
This picture is another view of the same flower cluster of the same plant. Though the pointed tip of the fused lateral sepals is not well shown in this plant as well as in some others, the feature is obvious in some plants.
This picture borrowed from http://www.orchidfoto.com/displayimage.php?pos=-2758 show broader lateral sepals with obtused tips of the fused sepals.
Bulbophyllum auratum (Lindl.) Rchb.f. 1861 is found in Sikkhim, peninsular Thailand and Malaysia to the Philippines. It has a number of synonyms and the most known one is Cirrhopetalum auratum Lindley 1840. Its name implies yellow color, but in fact, it has a variety of color ranging from pale yellow or pink, to bright yellow or pink. Usually the color of dorsal sepal and petals is light and dark longitudinal streaks are easily evident. The lateral sepals are long and broad and their tips are obtused. The angle of the lateral sepals to the umbel plane is close to 90 degrees.
This is a very nice Bulbophyllum auratum inflorescence from http://www.orchidsonline.com.au/node/7954. The flowers have pale pink lateral sepals and dark lips. The umbel is perfectly complete.
Note this inflorescence of Bulbophyllum auratum from http://www.ottawaorchidsociety.com/pics/mbg/bulbophyllum_auratum.jpg. The imperfectly round umbel, short lateral sepals, and the acute angle of flowers to the umbel plane.
Note this inflorescence of Bulbophyllum auratum from http://www.orchidfoto.com/displayimage.php?pos=-2761.
I am not saying which is right or wrong but there are some plants that seem to fall in between the two species. Bulbophyllum lovers in Thailand sometimes get unidentified plants from illegal wild orchid collectors and are unable to name them. They sometimes post on webboards, discuss the possibility of being this or that, and finally reach no conclusion.
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