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Ditrichaceae Limpr. in Rabenh., Laubm. Eur. 1: 482. 1887.
牛毛藓科
Cao Tong and Si He
Plants mostly minute to small, or at times to medium-sized, gregarious or in loose tufts, sometimes densely caespitose. Stems erect, simple or branched; central strand present or poorly developed or absent. Leaves usually lanceolate, acuminate or subulate, sometimes sheathing at base, seldom distichous; margins plane, reflexed or revolute, entire or serrulate; costa single, narrow, subpercurrent to long-excurrent; cells subquadrate or short-rectangular to linear, mostly smooth or occasionally mammillose; alar cells not differentiated. Sporophytes terminal; setae usually elongate, straight, sometimes very short; capsules often long-exserted, at times immersed to emergent, subglobose to cylindric, erect to inclined or curved, asymmetric; opercula often differentiated, conic or long-rostrate, sometimes absent; annuli mostly differentiated; stomata absent or present; peristome none or present with 16 teeth, divided in terete division or perforated nearly to the base, without vertical pitted-striolation or with oblique striolation. Calyptrae cucullate, rarely mitrate. Spores small, spherical, minutely papillose.
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| 1 |
Plants strongly flattened; leaves distichous or 3-ranked |
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(2) |
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Plants rounded; leaves neither distichous nor 3-ranked |
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(3) |
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| 2 (1) |
Peristome teeth present; leaves with a distinct sheathing base |
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3 Distichium |
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Peristome teeth absent; leaves without a sheathing base |
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11 Tristichium |
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| 3 (1) |
Upper leaf cells quadrate or nearly so; capsules furrowed when dry |
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(4) |
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Upper leaf cells rectangular; capsules smooth when dry |
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(5) |
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| 4 (3) |
Leaf margins reflexed or revolute, always unistratose; capsules deeply furrowed, strumose at base; plants yellowish green |
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2 Ceratodon |
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Leaf margins plane, sometimes bistratose above; capsules not deeply furrowed and not strumose at base; plants yellowish green with bluish sheen |
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9 Saelania |
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| 5 (3) |
Setae very short; capsules immersed or emergent |
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(6) |
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Setae elongate; capsules exserted |
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(9) |
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| 6 (5) |
Opercula not differentiated |
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7 Pleuridium |
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Opercula differentiated |
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(7) |
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| 7 (6) |
Peristome teeth present; leaves lanceolate |
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6 Garckea |
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Peristome teeth absent; leaves oval or ovate |
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(8) |
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| 8 (7) |
Leafy stems julaceous, glossy; leaf apices rounded or obtuse; calyptrae cucullate |
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1 Astomiopsis |
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Leafy stems not julaceous and lusterless; leaf apices broadly acute or apiculate; calyptrae mitrate |
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8 Pringleella |
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| 9 (5) |
Leaves distinctly sheathing at base, spreading and crispate when dry |
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10 Trichodon |
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Leaves not particularly sheathing at base, appressed and erect when dry |
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(10) |
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| 10 (9) |
Peristome teeth absent |
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4 Ditrichopsis |
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Peristome teeth present, normal |
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5 Ditrichum |
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List of lower taxa
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