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| 1 |
Capsules without a peristome, margins of leaf in proximal 1/3 denticulate. |
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Seligeria donniana |
| + |
Capsules with a peristome, margins subentire to entire. |
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(2) |
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| 2 (1) |
Spores 17--30 µm. |
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(3) |
| + |
Spores 10--16 µm. |
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(5) |
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| 3 (2) |
Spores (20--)23--30 µm; peristome of 16 reduced teeth, each of 5--8 cells. |
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Seligeria oelandica |
| + |
Spores 17--25(--27) µm; peristome of 16 fully developed teeth. |
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(4) |
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| 4 (3) |
Capsules turbinate when old and dry; seta 1--1.5 mm; columella elongate with opercula tending to remain attached; leaves often trifarious. |
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Seligeria tristichoides |
| + |
Capsules ovate, sometimes with flaring mouth when old and dry; seta 2--3 mm; columella short, not persistent, not attached to opercula; leaves spreading-recurved, evenly spaced around stem, not trifarious. |
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Seligeria polaris |
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| 5 (2) |
Costa excurrent, filling subulate apex. |
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(6) |
| + |
Costa (except in perichaetial leaves) ending just before apex, lamina present into apex. |
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(9) |
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| 6 (5) |
Seta curved 30--90° when wet. |
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Seligeria recurvata |
| + |
Seta straight when wet. |
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(7) |
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| 7 (6) |
Leaves wiry, stiffly flexuose, long-subulate, light green to dull-green; cells of leaf lamina longer than broad, pellucid; seta less than 1 mm; capsule turbinate when old, emergent. |
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Seligeria careyana |
| + |
Leaves recurved-twisted to stiffly erect, stoutly subulate from a wide base, dark-green to black; cells of distal leaf lamina usually as wide as long, opaque; seta greater than 1 mm; capsule ± ovate to oblong when old, emergent to exserted. |
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(8) |
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| 8 (7) |
Leaves stiffly-erect when dry; plants dark-green, gregarious; spores 14--16 µm; capsule contracted to seta through a wrinkled neck when old; eastern North America. |
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Seligeria calcarea |
| + |
Leaves twisted when dry; plants blackish, forming turfs; spores 10--14 µm; capsule ± sharply contracted to seta when old; western North America. |
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Seligeria subimmersa |
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| 9 (5) |
Plants light green; cells of leaf lamina pellucid, tending to be longer than broad; vegetative leaves linear, sometimes ± subulate; capsule turbinate to obovate, widest at mouth. |
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(10) |
| + |
Plants olive-green to dark-green; cells of distal leaf lamina ± opaque, usually as broad as long; leaves oblong to lanceolate; capsule ovate to oblong, not clearly widest at mouth. |
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(12) |
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| 10 (9) |
Perichaetial leaves subulate from an ovate, sheathing base, abruptly differentiated from vegetative leaves. |
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Seligeria acutifolia |
| + |
Perichaetial and vegetative leaves similar, sometimes distal leaves larger, but always similar to proximal leaves in shape. |
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(11) |
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| 11 (10) |
Leaves short, ligulate; apex broadly acute to obtuse; capsule ± pyriform when old; peristome large. |
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Seligeria brevifolia |
| + |
Leaves long, subulate; apex narrowly acute; capsule obovate to pyriform when old; peristome small. |
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Seligeria pusilla |
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| 12 (9) |
Leaves stiffly erect when dry, narrowed to an obtuse, incurved, channeled acumen; perichaetial leaves clasping and rapidly narrowed to stout subula; capsule ± as wide at middle as at mouth; seta ± thick, straight to slightly curved when wet |
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Seligeria diversifolia |
| + |
Leaves curved and loosely arranged when dry, narrowed to obtuse, plane, erect acumen; perichaetial leaves usually not clasping, similar to vegetative leaves; capsule wider at middle than at mouth; seta thin, curved 30--90° when wet. |
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Seligeria campylopoda |
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