Leaf cells
elongate-rhomboid, c. six times as long as wide; cell shape
homogenous throughout the leaf (except at the point of insertion to
the stem); plants almost always aquatic to semi-aquatic
Ochiobryum
Leaf cell
shape heterogeneous throughout leaf, cells in lower third of leaf
either longer or wider than those in the upper two-thirds; plant
habitats various
Ochiobryum