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Click the number at the start of a key lead to highlight both that lead and its corresponding lead. Click again to show only the two highlighted leads. Click a third time to return to the full key with the selected leads still highlighted.

Key to Pecluma

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1 Petiole and rachis lacking scales, but with acicular hairs and minute comblike hairs; veins (1-) 2-4-forked; sori surrounded by an oblong patch of erect hairs; segments at base of blade gradually reduced to auricles; [usually terrestrial]
1 Petiole and/or rachis with ovate to lanceolate scales (and also often with additional vestiture of acicular hairs, septate hairs, or minute comblike hairs); veins 1-2-forked; sori without a patch of erect hairs; segments at base of blade abruptly reduced in size; [usually epiphytic or epipetric].
..2 Veins (1-) 2-forked; scales of the rachis and petiole hastate-cordate, flat; spores 32 per sporangium, mostly spherical; [usually on rocks]
..2 Veins 1-forked; scales of the rachis and petiole cordate, appearing inflated; spores 64 per sporangium, mostly reniform; [usually epiphytic]
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