| 1 |
Sexual condition dioicous, autoicous, synoicous, or polyoicous; peristome well developed; endostome basal membrane 1/2 exostome height; spores 10-26(-30) µm |
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(2) |
| + |
Sexual condition usually synoicous, rarely autoicous or polyoicous; peristome well developed or reduced; endostome basal membrane usually less than 1/2 exostome height; spores (8-)22-30(-50) µm |
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(9) |
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| 2 (1) |
Sexual condition autoicous; spores 18-22 µm; stems comose, innovations comose or somewhat elongate and evenly foliate. |
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11 Ptychostomum pallescens |
| + |
Sexual condition dioicous, synoicous, or polyoicous; spores 10-26(-30) µm; stems tufted or comose, rarely evenly foliate, innovations comose or somewhat elongate and evenly foliate |
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(3) |
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| 3 (2) |
Sexual condition dioicous; leaf bases strongly decurrent; stems tufted, weakly comose to evenly foliate, usually strongly radiculose well toward stem apices, innovations elongate and evenly foliate; specialized asexual reproduction occasional, by leaf axil gemmae. |
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13 Ptychostomum pseudotriquetrum |
| + |
Sexual condition dioicous, synoicous, or polyoicous; leaf bases not or weakly decurrent; stems tufted and/or comose, strongly or weakly radiculose, innovations comose or somewhat elongate and evenly foliate; specialized asexual reproduction absent |
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(4) |
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| 4 (3) |
Leaves strongly twisted to contorted when dry, concave; apices broadly acute to obtuse; costae usually not reaching apex to percurrent; sexual condition dioicous |
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(5) |
| + |
Leaves somewhat twisted or contorted when dry, flat to weakly concave; apices acute to acuminate; costae short- to long-excurrent; sexual condition synoicous or polyoicous |
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(6) |
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| 5 (4) |
Leaves crowded; bases wide. |
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9 Ptychostomum neodamense |
| + |
Leaves distant; bases narrow. |
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16 Ptychostomum subneodamense |
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| 6 (4) |
Innovations elongate, evenly foliate; leaves not much enlarged toward stem apex; bases weakly decurrent; costae short-excurrent; distal laminal cell walls sometimes very incrassate, sometimes oblique to costa; sexual condition synoicous. |
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2 Ptychostomum bimum |
| + |
Innovations comose or somewhat elongate and evenly foliate; leaves usually enlarged toward apex; bases not or weakly decurrent; costae long-excurrent; distal laminal cell walls thin to firm, never oblique to costa; sexual condition synoicous or polyoicous |
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(7) |
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| 7 (6) |
Sexual condition synoicous; spores (18-)20-26(-30) µm. |
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5 Ptychostomum intermedium (in part) |
| + |
Sexual condition synoicous or polyoicous; spores 10-18(-20) µm |
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(8) |
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| 8 (7) |
Sexual condition synoicous; limbidium in 2 or 3 rows, yellowish. |
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3 Ptychostomum creberrimum |
| + |
Sexual condition polyoicous; limbidium in (2-)3-4(-6) rows, concolorous. |
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7 Ptychostomum lonchocaulon |
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| 9 (1) |
Endostome strongly adherent to exostome; exostome teeth appearing chambered; leaf apices acuminate; costae long-excurrent; capsules pyriform; spores (22-)25-30 (-36) µm. |
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12 Ptychostomum pendulum |
| + |
Endostome usually not adherent to exostome; exostome teeth not appearing chambered; leaf apices obtuse, acute, or acuminate; costae not reaching apex to long-excurrent; capsules pyriform or obovate; spores (15-)22-50 µm |
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(10) |
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| 10 (9) |
Leaves strongly concave, ± imbricate to weakly contorted or shrunken when dry; costae not reaching apex to percurrent, rarely short-excurrent; spores 15-22(-25)µm; capsules short-pyriform, asymmetric, curved; endostome cilia usually present. |
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10 Ptychostomum nitidulum |
| + |
Leaves flat or concave, twisted to contorted or shrunken when dry; costae percurrent to long-excurrent; spores (18-)22-50 µm; capsules obovate or short- to elongate-pyriform, symmetric (asymmetric, somewhat curved in P. intermedium); endostome cilia present or absent |
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(11) |
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| 11 (10) |
Sexual condition autoicous; leaves concave; limbidium indistinct; costae percurrent in proximal leaves to sometimes short-excurrent in distal leaves; specialized asexual reproduction by leaf axil gemmae; spores (28-)30-40 µm. |
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14 Ptychostomum reedii |
| + |
Sexual condition synoicous; leaves flat to concave; limbidium strong; costae usually short- to long-excurrent; specialized asexual reproduction absent; spores (18-)20-50 µm |
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(12) |
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| 12 (11) |
Capsule mouths orange or yellow; endostome basal membrane 1/2 exostome height, cilia present, sometimes reduced; spores (18-)20-26(-30) µm |
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(13) |
| + |
Capsule mouths yellow or red; endostome basal membrane usually less than 1/2 exostome height, cilia rudimentary or absent; spores (18-)20-50 µm |
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(14) |
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| 13 (12) |
Cilia rudimentary or sometimes 1 or 2, long, appendiculate to nodose; capsules symmetric, mouths straight. |
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4 Ptychostomum inclinatum |
| + |
Cilia long, nodose; capsules asymmetric, mouths oblique. |
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5 Ptychostomum intermedium (in part) |
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| 14 (12) |
Leaf apices acute to obtuse; costae percurrent to short-excurrent, awns recurved; setae (2-)3-6(-8) cm; spores (18-)20-50 µm |
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(15) |
| + |
Leaf apices acuminate; costae short- to long-excurrent, awns straight; setae 1-3 cm; spores (18-)22-30 µm |
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(16) |
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| 15 (14) |
Leaves strongly concave; apices acute to obtuse; costae percurrent to short-excurrent; spores (18-)20-30 µm; setae (2-)3-4 cm. |
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6 Ptychostomum knowltonii |
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Leaves weakly concave; apices acute; costae short-excurrent; spores (38-)40-50 µm; setae 3-6(-8) cm. |
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8 Ptychostomum longisetum |
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| 16 (14) |
Spores dark brown to black; exostome teeth with pores absent along mid line; endostome sometimes weakly adherent to exostome at base; operculum short-convex, not or weakly apiculate. |
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1 Ptychostomum archangelicum |
| + |
Spores pale yellow-brown; exostome teeth with small pores present along mid line at base; endostome not adherent to exostome; operculum long-conic, distinctly apiculate. |
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15 Ptychostomum salinum |
