|Leptodictyum occurs in thick underwater mats. The stems are long, straight and sparsely branched. The leaves are spread stiffly in one plane, even when dry. From Franck 3314 (USF).|
Leptodictyon is distinguished from other aquatic mosses by its long, straight, sparsely branched stems, with leaves extending stiffly from the sides of the stem (in more or less one plane). The leaves remain more or less stiff when dry, by may be somewhat rumpled. It rarely produces sporophytes in our area. Hygroamblystegium has shorter, more branched stems that tend to be more curved when dry, and shorter, more triangular leaves distributed uniformly around the stem. It is also more often found with sporophytes. Species of Fissidens are distinguished by their doubled leaves.
|The leaves of Leptodictum have a distinct midrib, but which|
does not quite reach the tip. From Franck 3314 (USF)
The leaves have a distinct midrib, and the leaf cells are generally elongate with thin, inconspicuous walls. Sporangia, when present, are somewhat curved and asymmetric, but none have been found among the specimens at USF.
|The leaf cells are somewhat elongate and tapered at the ends, |
but do not stand out sharply under the microscope. From
Lassiter et al 559 (USF)