In addition to pictures I took specifically to illustrate mosses and ferns, there are photos here, collected from other galleries, that show some of the charming or picturesque ways in which mosses in particular, 'invade' various environments.
Topaz Spring millrace. This shows the slot in the concrete wall of the millrace into which a board is placed in order to block the exit of the spring water from the side of the millrace. When the picture was taken, this board was, instead, inserted in a similar slot farther along the millrace (toward the mill), preventing the flow of water to the mill. It's a crude kind of a valve.
Topaz Spring millrace. This shows the slot in the concrete wall of the millrace into which a board is placed in order to block the exit of the spring water from the side of the millrace. When the picture was taken, this board was, instead, inserted in a similar slot farther along the millrace (toward the mill), preventing the flow of water to the mill. It's a crude kind of a valve.
See photo in original gallery.