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It struck me as smaller, and strictly adnate as compared with Porella platyphylla.

On a north-facing vertical bedrock exposure above a woodland stream.

The leaves are half the size (0.5 mm) of Porella platyphylla (1.0 mm).

reference Porella platyphylla observation: https://www.inaturalist.org/observations/198221004

On a rock cascade of a seasonal stream. Even at this moist time of year, the water did not flower over this moss. Such an event must be infrequent at best, which surprises me very much, as I am accustomed to seeing Fontinalis in situations where it is submerged and must be so for much of the time, given the locations in which it has been found.

Endemic to the Appalachians and one of the only aquatic lichens, this species is uncommon and is indicative of high water quality. It looks like it belongs in a tidal pool. A Pennsylvania 'Watchlist' species.

3' by 4' patch of a brown leafy organism resembling an alga growing on rocks in seepage area along riverbank

Sparse apothecia on dorsal side. Tomentose veins on ventral side.

The cell photos are 100x and 500x.

Photos are of specimen while wet. On concrete, east facing side of multi story building, second story. Lower surface with patches of white tomentum, image 5. Attempted thallus cross section, image 7. Spores muriform. Last photo is of a thin slice of cortex, showing jigsaw puzzle piece shaped cells.

Photo credit and determination: M. Hodges

First known documentation of this species in Alabama and outside of the Florida peninsula.

Only growing on Chamaecyparis thyoides approx. 1-2 m above ground on the trunk. This specimen was documented on a windthrown tree in full sun.