Odontidium Hymale Guide
Credit: Ian Bishop
  1. Valves narrow, lanceolate
  2. Spines present
  3. Sternum lanceolate, distinct
  4. Costae parallel to slanted
  5. Rimoportula present

Valves are narrow and lanceolate, with broadly rounded apices. Costae are parallel to diagonal, numbering 3-5 in 10 um. The axial area in linear to lanceolate, increasing in breadth as cells decrease in size. The sternum is distinct and intrudes into apical porefields at both ends. Spines are present. A single sub-apical rimoportula is positioned at one apex.