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Photos 1-3 compare D. lucidum (left) with D. microcarpon (middle) and D. dichotomum var. dichotomum (right).

It co-occurs and mingles with microcarpon, and its leaf proportions can be very similar to the autumnal leaves of micro. However, D. lucidum lacks bearded nodes (the lowest one may have some hairs) and its leaves are consistently sized; micro has conspicuously larger vernal leaves. It also has thinner, wirey culms and it has a more horizonal/creeping habit.

D. dichotomum var. dichotomum is more of an upland species and is unlikely to closely associate, but it can occur in uplands adjacent to seeps and is also visually similar. dichotomum has a strictly upright habit, proportionately longer/narrower leaves, and wider culms; its leaves are also held differently (more regular and parallel to the ground?).

Likely can’t be discerned to be a single species without knowing the host plant or dissection... there isn’t much foliage around here, super compact living, there’s plants you typically find in salt marshes, some small commercial flowering plants like pansies and such here and there and some conifers (mostly juniper)