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Strictly pileate, narrowly attached, annual. Pileus tomentose. Hymenium lamellate, sub-hydnoid in places. Hymenal setae present, dark brown, acute, straight, hyphidia present, abundant, apparently roughened, not branched, not strongly knobbly. Cortex absent, dark line absent in context.
The radially lamellate hymenium is very unusual for Hymenochaete (including Cyclomyces).

I'm unsure of which species this tiny mushroom is. They're growing in clusters, in my fine-leaved couch lawn. They are varying in size across the cap from about 8-10mm to about 20-25mm when fully open(flat). We had some good rains a couple of days ago.