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Exposed rock crack within ephemeral stream.

Seems to intergrade between Imbribryum gemmiparum and Gemmibryum dichotomum. The cauducous pups in the axils are not gemmae-like though, they are very leafy matching exactly that of the gemmae of I. gemmiparum in Michael Leuth’s book.
However the plants are small, .5cm, and the costa is percurrent to often short excurrent as an apiculus or short awn, which is more consistent with G. dichotomum.