A species from southern and central Africa named after John Sanderson (1820-1881), Scottish horticulturist and botanical collector in South Africa.
Grows epiphytically in in large clusters. Pseudobulbs 3-5 cm apart, growing from a woody rhizome. Variable in size and shape, usually ovoid or pear-shaped, yellow, 2-leaved. Inflorescence erect, up to 20cm long on a thick, swollen, rhachis. Flowers 10-16, set alternately on either side of the rhachis, essentially yellow-green - sometimes heavily mottled with purple.
Bulbophyllum - With nearly 2000 species this is one of the largest genera in the orchid family with a widespread distribution. They grow well in high humidity, moderate warmth and some shade - good light is needed for flowering.