Plants are very small. Small pseudobulb and small leaves at the base of the shoot. The inflorescence is usually multiflorous. Flowers inconspicuous, not twisted, due to which the lip is directed upwards. Perianth leaves are translucent. There is no spur. Fine pillar, straight. Stamen straight, bent back after spilling pollen. Rostellum small, triple toe. Birthmark hollow. Winged mycobacteria.
The genus includes only one species – marsh thread (Hammarbya paludosa) – growing in the temperate zone of the Northern Hemisphere.
No observations of the pollination of the threads have been made so far. Perhaps it is a self-pollinating species, which is not excluded by the construction of its generative structures.
Marshmallow (Hammarbya paludosa)
Pseudobulb 5-10 mm length, 5-7 mm in diameter, usually ovoid.
Momentum 5-20 cm h., delicate, straight, peg, green to yellow-green.
Leaves 2-3, length. 8-25 mm, 5-10 mm width, ovate to oblong, rounded at the top, fleshy, sometimes with adventitious pseudo-tubers on the edge.
Inflorescence 3-6 cm length, multiflorous, rather loose.
The flowers are very small, not twisted, all green or green-yellow, with translucent perianth leaves, na warżće 2-4 dark green lines.
Pituitary gland approx 1 mm length, lancetowata, spicy, membranous, pale greenish.
Peduncle about 2 mm length, straight, not twisted, yellowish or greenish.
Hives about 1 mm length, barrel-bloated to almost round.
Lipka do 2 mm length, about 1 mm width, ovoid, sharply ended, slightly concave in the center.
The upper outer petal to 3,5 mm length, about 1 mm width, equilibrium-lanceolate, blunt, flat.
Lateral outer petals 2-3 mm length, about 1 mm width, lancetowate do jajowatolancetowatych, sickle-shaped or sigmoidal, spicy, slightly bent back.
Lateral inner petals approx 1 mm length, about 1 mm width, jajowate, narrowed and pointed towards the top, strongly bent back.
The fruit with the stem approx 3-4 mm length.
In Poland, this species was administered from different parts of the country, it is somewhat more common in the north and northeast.
Wątlik is a species of transitional mires, humid inter-dune depressions. Sometimes it grows on floating islands built by sphagnum moss. It occurs on wet soils, usually poor, acidic and very acidic.
It blooms in July and August.