3. Myurella tenerrima (Bridel) Lindberg, Musc. Scand. 37. 1879.
Pterigynandrum tenerrimum Bridel, Muscol. Recent., suppl. 4: 132. 1818
Plants pale green to yellow-green. Stem leaves erect to spreading, distant, round to ovate, 0.3-0.4 mm; margins serrulate; apex shortly acuminate-apiculate; distal laminal cells faintly prorulose abaxially.
Moist calcareous habitats, fens, rock crevices, tundra meadows; low to high elevations; Greenland; Alta., B.C., Man., Nfld. and Labr., N.W.T., Nunavut, Ont., Que., Yukon; Alaska; Europe; n Asia; n Africa.
Myurella tenerrima is an Arctic and northern boreal species. This species is similar to M. julacea in color and general habit, but has widely spaced leaves that end in a well-developed, often recurved apiculus. The species differs from M. sibirica in features of the leaf papillae and margins.