Pterygoneurum lamellatum is a western and High Arctic moss in North America that has two kinds of photosynthetic enations on the adaxial (ventral)...
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Pterygoneurum lamellatum is a western and High Arctic moss in North America that has two kinds of photosynthetic enations on the adaxial (ventral) surface of the costa (midrib), the usual lamellae of Pterygoneurum and in this particular specimen from Alaska the (short) filaments of Crossidium.
