Epidendrum unicallosum Hágsater & Santiago (2006

Díaz-Morales, Melissa & Karremans, Adam P., 2016, Epidendra Nova Talamancana, Phytotaxa 272 (4), pp. 248-256 : 253

Epidendrum unicallosum Hágsater & Santiago (2006 : t.895)

Type: — PANAMA. Chiriquí: Guadalupe, 20 February 2001, A. Maduro & E. Olmos 179 (holotype, AMO).

Material Studied:— COSTA RICA. Limón: Talamanca, Bratsi, Parque Internacional La Amistad , Valle del Silencio , alrededores de refugio, bosque pluvial montano, 2,462 m, 9°06’41.81” N 82°57’42.44” W, 18 September 2014, Karremans et al. 6335, (JBL-spirit!; fig. 3 ). Limón: Talamanca , Parque Internacional La Amistad ( PILA), sector Altamira, Valle del Silencio , sendero a El Jardín, epífitas en bosque primario, bosque pluvial montano, 2,550 m, 18 September 2014, Fernández et al. 925 (JBL-spirit!). Limón: Talamanca, Bratsi, Parque Internacional La Amistad , Valle del Silencio , orillas del Río Terbi cerca del andarivel, bosque pluvial montano, recolectada por D. Jiménez, 2,462 m, 9°06’41.81” N 82°57’42.44” W, 6 May 2013, Bogarín 10133 (JBL-spirit!). Limón: Talamanca, Parque Nacional La Amistad , Tararia, Valle del Silencio , 2 km antes del albergue, 2,400–2,500 m, 9°06’10” N 82°58’25” W, 18 November 2004, Soto & González 291 ( CR-INB!) .

Epiphytic, sympodial, climbing herb, up to 20 cm tall including the inflorescence. Roots 2–3 mm in diameter, thin, fleshy. Stems 10.3–11.7 × 0.3–0.4 cm tall, erect, cane-like, terete, each new one produced from an internode of the previous stem. Leaves 3–4, restricted to the apical half of the stem; leaf sheath 0.9–2.1 cm long, tubular, verrucose; blade 1.7–2.5 × 0.6–0.9 cm, articulate, lanceolate, acute, with margins entire. Spathaceous bracts lacking. Inflorescence 2.0– 2.5 cm long, apical, from mature growth, racemose, erect, lax. Floral bracts 2.0– 2.5 mm long, up to 7 times shorter than the ovary, acute, incurved, green. Flowers 5–9, successive, 4–5 open at once, resupinate, pink to purple. Sepals free, spreading, 5-veined, glabrous, margin entire; dorsal sepals 8.1 × 3.5 mm, oblanceolate, obtuse; lateral sepals 10.2 × 3.5 mm, elliptic, acute. Petals 8.2 × 2.3 mm, free, spreading, 3-veined, glabrous, margin entire, oblanceolate, obtuse. Lip 6.0–6.5 × 4.0– 4.5 mm, fused to the column, trilobed, margin entire, white, callus single; lateral lobes elliptic, acute, oblique, divaricate; mid-lobe oblong, acute. Column 6.5–7.0 mm long including the clinandrium-hood, straight, white to purple on the base; clinandrium-hood almost half the length of the column, the margin crenate, white with purple to red dots on the outer crenations; rostellum perpendicular to the axis of the column. Anther ovoid, 4-celled. Pollinia 4, ovoid, laterally compressed, the inner pair half the size of the outer pair. Capsule not seen. Note: Description based only on Karremans 6335.

Distribution:— Panama and Costa Rica.

Etymology:—The name unicallosum makes reference to the single callus of the lip ( Hágsater & Santiago 2006).

Habitat in Costa Rica:—Known from Valle del Silencio protected area in La Amistad National Park. It grows epiphytically in a montane rainforest, at above 2400 m elevation.

Phenology:—Collected with flowers in September and November.

Figures

FIGURE 3. Epidendrum unicallosum Hágsater & E.Santiago. Lankester Composite Digital Plate (LCDP).A. habit. B. flower. C. dissected perianth. D. lateral view of the column and the lip. E; pollinarium. F. lateral view of the longitudinally dissected column, with the nectary exposed. G. column (ventral and lateral views).