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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

2005, Northern Kentucky University's Costa Rican Natural History course. We spent an hour or two at Volcan Poas, hiking up the main trail to see the crater lake. There were many melastomes along the way.

This individual was found in mucky organic soil at the edge of a small, spring-fed rivulet, which was running along the outer edge of a graminoid-dominated bog. The last photo is the best habitat shot I have, unfortunately. The small rivulet runs along the base of/somewhat undercuts the bluff, and thus is not super visible in the photo. The plant was collected near where the grassy edge of the bog and the edge of the rivulet meet, more or less directly in front of where the person in the photo is standing.

Ruler units are 0.5 mm.

https://www.inaturalist.org/observations/183415649
Here is an additional observation of the same individual, with more close-up photos of the plant taken in the field.