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Key to Argyrochosma
https://fsus.ncbg.unc.edu/main.php?pg=show-key.php&keyid=40790
1 Lower surface of leaf blades densely covered with white farina; ultimate leaf segments not articulate (the brown color of the petiole continuing into the midvein of the segment, most visible on the upper side of the segment) | |
1 Lower surface of leaf blades glabrous; ultimate leaf segments articulate (the brown color of the petiole ending abruptly at the segment base) |