Family : Orchidaceae
Text © Pietro Puccio
English translation by Mario Beltramini
The species is native to the Philippines (Luzon, Mindoro, Leyte and Samar) where it grows on the trees of the rain forests and of mangroves at low altitudes.
The name of the genus is the combination of the Greek substantives “δένδρον” (dendron) = tree and “βίος” (bios) = life, with reference to the numerous species of the genus living on the trees; the species is honoured to the American botanist Elmer D. Merrill (1876-1956), scholar of Philippines flora.
Common names: Merrill’s dendrobium (English).
The Dendrobium merrillii Ames (1908) is an epiphytic species with close stems, 12-18 cm long, compressed laterally, provided of alternate leaves, distichous, imbricate, equitant (at a single face with lamina folded in two along the central vein), lanceolate with acute apex, about 1,4 cm long and 0,7 cm broad, of intense green colour, fleshy.
Inflorescences from the apical nodes bearing flowers, of about 4 mm of diameter, of white colour with purple veins on the lateral lobes of the labellum; pedicel and ovary about 5 mm long.
Oblong dorsal sepal with obtuse apex, about 2 mm long and 1 mm broad, oblong-triangular lateral sepals with acute apex, about 2 mm long and 1,5 mm broad, petals about 2 mm long and 0,5 mm broad, trilobed labellum, about 4 mm long and 1,5 mm broad, and column about 1 mm long.
It reproduces by seed, in vitro, and by division, with each section provided of at least 3-4 pseudobulbs, and through the young plants at times generating at the nodes (in jargon “keiki”, that in Hawaiian means “sons”), that can be removed once they have formed a good rooting apparatus.
Miniature orchid, rare in cultivation, requires a semi-shady and aerated position, medium-high temperatures, 22-32 °C, and high humidity, 75-85%.
Frequent waterings during the vegetative period, more spaced in winter in order to grant a light period of rest, utilizing rain water, demineralized or by reverse osmosis.
Can be mounted on small logs, pieces of bark or rafts covered by sphagnum, or cultivated in pot or baskets with a draining compost based on medium sliced bark fragments and sphagnum. The species is reported in the appendix II of the CITES (species whose trade is internationally ruled.
Synonyms: Aporum merrillii (Ames) M.A.Clem. (2003).
The photographic file of Giuseppe Mazza