|Habitat||Perennial. fen, hill zone.|
Culm-diameter 0.5-1 mm, center full, radius of culm in relation to wall thickness 1:1. circular wavy. Culm-center full, containing unlignified cells. Center with net-like aerenchyma (stellate). Epidermis cells thick-walled all around. Cuticula very thick.
Rhizome diameter 1-1.99 mm, Rhizome center full, containing unlignified cells. Endodermis absent.With cortex/central cylinder separation. Endodermis present. Endodermis cells u-shaped, thick walled. Cells in the cortex round. Vascular bundles in the corte