WARNING: This information is inaccutate. Please see this more recent post for additional information.
Atrichum is in the moss family Polytrichaceae, which also contains the genus Polytrichum. This genus is similar to Atrichum in that they both have lamellae (aka. moss snorkels) on their leaves. The difference is that the lamellae in Polytrichum cover the entire surface of the leaf, whereas in Atrichum there are fewer lamellae per leaf (around 1-9) and they are located only on the midrib. The photo to the right is of a cross-section through a leaf that has four lamellae on the thickened midrib.
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