AFRICAN

ORCHIDS

Angraecum atlanticum Stévart & Droissart, Syst. Bot. 35: 253 (2010).
Description:
Stem pendant, branched, leafy, up to 25 cm long, 0.8 mm in diameter. Root system extensive and succulent, roots up to 0.5 mm in diameter. Leaves elliptical, fleshy, 1.8–2.2 mm wide, 10–16 mm long, curved, folded along the midvein forming a channel, apically with a sharp narrowly triangular point 2–2.5 mm long, internodes 6–7 mm long. Inflorescence short, less than 1 mm long, emerging along the stem or opposite a leaf, suberect, subsessile, one-flowered; sheath brown, much shorter than the ovary. Flowers white, scented, bract one, amplexicaul, broadly ovate, apiculate, 1.8–1.3 mm long. Dorsal sepal 5.5 × 1.7 mm, elliptical, 4-nerved, concave, margins recurved in the apical half. Lateral sepals 5.5 × 1.5 mm, elliptical, 5-nerved, concave, margins recurved in the apical half. Petals 4 × 1.2 mm, elliptical, 3-nerved, concave, margins recurved in the apical half, similar in shape to the sepals. Lip 4 × 4 mm, obovaterhomboid, when flattened, widest in the basal third, acutely acuminate distally; spur 4–4.5 × 0.8 mm, ellipsoidal, slender, straight, somewhat inflated in the middle, attenuate in the basal four fifths. Pedicel and ovary not twisted, Column short; 1 × 0.8 mm. Pollinia 2, pyriform.
Habitat:
Angraecum atlanticum is found in epiphyte-rich submontane forest in Gabon at around 600 m elevation, and in Equatorial Guinea in the shrubby fringes of areas rich in Burseraceae, at around 1,100 m elevation. The species has been found growing as an epiphyte on fallen branches among bryophytes and Stolzia species. It has not yet been recorded from Cameroon, but it may well occur in the Ngovayang-Akom II area in the South region, which has the same type of vegetation as occurs in the areas where this species has already been documented.
Phenology:
Flowering occurs in January and from May to October.
Cultivation:
As given for the genus.
Distribution:
Equatorial Guinea to Gabon
References:
Taxonomic Revision of the Continental African Species of Angraecum Section Pectinaria (Orchidaceae), Systematic Botany (2014), 39(3): pp. 725–739, 2014; WCSP (2017). 'World Checklist of Selected Plant Families. 25.01-2017; http://apps.kew.org/wcsp/
Images:
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Habitat/In situ In culture In culture
angreacum atlanticum angraecum atlanticum angraecum atlanticum. close up
Photograph Pieter C, Brouwer ©Swiss Orchid Foundation at the Herbarium Jany Renz Image used with kind permission. Photograph©Rogier van Vugt. Image used with kind permission. Photograph©Rogier van Vugt. Image used with kind permission.