See Calvente thesis 2010
Epiphyte, in open or shaded habitat, 1-2 m long, branching apical or
sub-apical, rare lateral. Stem segments flattened, triangular, quadrangular
or hexagonal in longitudinal section, ca. 1-2 mm diam, olive, medium
or dark green, succulent but stiff and sometimes woody, monomorphic
or dimorphic, (5-)11-20(-30) cm long, base attenuate or truncate, apex
truncate; wings 2-6, 0.1-0.4(-0.5) cm wide, margin slightly serrate
to entire, plane, with 0-1.5(-2) mm projections, midrib 1.5-2(-5) mm
diam, cylindric. Areoles between margin projections, 1-4.5 cm apart,
first of segment 0.5-3.5 cm distant from segment base; when sterile
1-3 mm diam, glabrous or with 1-4 acicular scales; when fertile 1.5-3
mm diam, glabous or pilose, with 1(2) flowers/fruits. Flowers 6-8 mm
diam; pericarpel ca. 3.4-4 X 3-3.7 mm, cylindric, greenish, glabrous
or with sepaloid bract; with 1-4 sepaloid tepals, 0.5-1 .5 mm long and
5-8 petaloid tepals, (2-)5-6.5 X 1.5-1.8 mm, oblong to elliptic, patent
or sub-erect, whitish, apex rounded, slightly cucullate, margin straight.
Style ca. 4 mm long; stigma with 3-4 lobes, 1.5 mm long, ligulate, curved,
sub-reflexed. Ovules in 3 rows,
Notes. Some forms of R. micrantha subsp. tonduzii from Ecuador have 2-winged and narrow secondary stem segments that can present dark-brown and floccose deposition in the stems (wax?) after drying. It can be separated from R. micrantha subsp. micrantha and R. micrantha subsp. rauhiorum by the narrower and stiffer wings and from R. micrantha subsp. monticola by the 2-winged secondary segments. When the 2-winged secondary segments are lacking, this species can be distinguished from R. micrantha subsp. monticola by the stem segments that are straight and less succulent, with almost entire margins.
Habitat and distribution: It occurs in Ecuador and Costa Rica, usually in coastal and lowland forests, but also in higher altitudes, ranging from 50-2250 m.
Rhipsalis tonduzii Weber, Dict. Hort. Bois 1046. (1898).
Type locality: Costa Rica.
Notes from Flora of Costa Rica “Collected at Ochomogo, bridge of Rio Tarrazu near San Marcos, Jimenez, and Piedras Negras, at 800 - 1,530 metres. Endemic”