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| 1 |
Middle outer marginal cells of the leaf quadrate, subquadrate, short-rectangular or oblate [ratio length/width (0.3)0.6-1.9(2.8)]; capsule erect |
2
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| 1 |
Middle outer marginal cells of the leaf linear to long-rectangular [ratio length/width 7.5-40]; capsule horizontal or cernuous |
T. cernua
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| 2 |
Upper and middle laminal cells smooth or with 1-3 simple papillae, 1 μm high |
3
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| 2 |
Upper and middle laminal cells with (2)4-6(10) simple or bifurcate papillae, 2.5-5 μm high |
5
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| 3 |
Capsules cleistocarpous, immersed; leaves usually triangular-lanceolate to oblong or lingulate |
4
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| 3 |
Capsules cleistocarpous, immersed; leaves usually triangular-lanceolate to oblong or lingulate |
T. acaulon
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| 4 |
Leaves elliptical to lanceolate, or linear; costa excurrent in a hair-point [(700)1230-1740 μm]; theca cylindrical; peristome of 32 papillose teeth |
T. arequipensis
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| 4 |
Leaves usually obovate; costa percurrent or excurrent in mucro [75-450 μm]; theca turbinate; peristome teeth undifferentiated |
T. truncata
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| 5 |
Ventral surface cells of the costa rounded to rectangular, (15)22.5-25(32.5) μm length, bulging, disposed in 1-2 layers (in cross-section) |
6
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| 5 |
Ventral surface cells of the costa quadrate, rectangular, sometimes subquadrate, rarely oblate or rounded, (7.5)10-17.5 μm length, not bulging, disposed in 1 layer (in cross-section) |
7
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| 6 |
Leaf lingulate to oblong-lingulate or obovate, rarely elliptical; leaves margins strongly recurved to revolute from near the base to near the apex |
T. atrovirens
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| 6 |
Leaf widely ovate to elliptical or orbicular; leaves margins plane |
T. diaguita
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| 7 |
Costa usually ending 2-6 cells below the leaf apex; basal laminal cells usually slightly thick-walled and papillose; perichaetial leaves slightly sheathing at base |
T. jaffuelii
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| 7 |
Costa usually excurrent in a mucro, apiculus, hair-point or percurrent, rarely ending 2-3 cells below the leaf apex; basal laminal cells thin-walled and smooth; perichaetial leaves not sheathing at base |
8
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| 8 |
Middle laminal cells 12.5-20 µm wide |
9
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| 8 |
Middle laminal cells (5)7.5-12.5(15) µm wide |
10
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| 9 |
Leaves unbordered; peristome teeth 200-230 μm long, straight; spores 17.5-20 μm in diameter |
T. hoppeana
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| 9 |
Leaves bordered; peristome teeth c. 510 μm long, spirally twisted; spores 7.5-10 μm in diameter |
T. vahliana
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| 10 |
Leaves without intramarginal borders or scarcely differentiated [ratio length/width of middle inner marginal cells (0.7)0.9-1.3(1.6)]; peristome teeth more than one turn spirally twisted; basal membrane of peristome (32.5)41.3-81.3(95) μm long |
T. muralis
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| 10 |
Leaves with strongly differentiated intramarginal borders [ratio length/width of middle internal marginal cells (0.8)1.8-3.6(4)]; peristome teeth straight or less than one turn spirally twisted; basal membrane of peristome (87.5)100-132.5(150) μm long |
T. platyphylla
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