Rhabdoweisia is not a genus I've had much experience of, so I'd welcome any advice on this one. The habitat (above) and lack of a peristome on most capsules say fugax, but the leaves seem to say crispata (i.e. cell width in upper part of leaves mostly 12-15µm, leaf lamina avge cell count at 220µm from leaf tip =7 and rounded leaf shape with irregular teeth). Cynodontium bruntonii was the only direct associate, but others on the same crag included Racomitrium aquaticum, Andreaea rothii subsp. falcata, Diplophyllum albicans, etc.
Marsupella marginata var. marginata was frequent including patches in fruit