| Serrulata means saw-bearing, so named from the serrulate character of the gills. |
| Isothecium alopecuroides, the species on the picture, has about 2-3mm long leaves, which are only indistincly serrulate at the upper part. |
| Besides, the sterile fronds of the latter have serrulate segments. |
| Broadest at the base, with lanceolate, serrulate divisions united by a broad wing. |
| The edge of the leaf is at least in the upper part serrulate. |
| In some other plants the edges are serrulate, crenulate, etc. |
