1a. Leaf margins are entire. —–2.

1b. Leaf margins are toothed. —–3.

2a. Moss is no taller then 3cm, leaves are bluish-green.                          —–Cyrtomnium hymenophylloides.

2b. Moss may grow up to 5cm tall, and often has dark red                stem and and midrib. —–Rhizomnium punctatum.

3a. Leaf margins are double toothed, Leaves become more            crowded towards the tips of the steam.                                                                 —–Mnium hornum.

3b. Leaf margins are single toothed. —–4.

4a. Teeth on the margins run from the base of the leaf to the          apex. —–Plagiomnium ciliare.

4b. Teeth on the margins begin around the middle of the leaf        and continue to the apex. —–Plagiomnium cuspidatum.