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Pogonatum P. Beauv. Search in The Plant ListSearch in Index Nominum Genericorum (ING)Search in NYBG Virtual HerbariumSearch in JSTOR Plant ScienceSearch in SEINetSearch in African Plants Database at Geneva Botanical Garden Decrease font Increase font Restore font
 

Published In: Magasin Encyclopédique 5: 329. 1804. (Mag. Encycl.) Name publication detail
 

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Notes     (Last Modified On 4/3/2009)
general taxon notes:
The species of Pogonatum are widely distributed in the world. Their habits, leaf shapes, and lamellae are quite variable among species, but the apical cells of each species are unique and are important features in recognizing individual species. There are about 52 species in the world, and 18 species and 2 subspecies are known in China. Most species are widely distributed in mountainous regions and moist habitats.

 

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5. Pogonatum P. Beauv.   小金发藓属   xiao jin fa xian shu
Mag. Encycl. 5: 329. 1804.
 
Plants mostly robust, rigid, rarely short, small and weak, usually in dense tufts, a few species growing with persistent protonemata. Stems erect, rarely branched, covered with reddish rhizoids below; stem in cross section rounded, rounded-triangular or multi-angled; central strands present. Leaves spirally arranged, appressed, incurved or crisped when dry, erect-spreading when moist, not undulate, usually broadly to narrowly lanceolate from a sheathing, membranous base; margins coarsely serrate or serrulate, not bordered; costa narrow, flat in sheathing bases, broader above, percurrent or excurrent, with well-developed stereid bands; upper laminal cells homogeneous, hexagonal or quadrate, thick-walled, usually bistratose except at margins (only P. contortum, P. cirratum,and P. japonicum with bistratose leaf margins); lamellae densely arranged on ventral surfaces of leaves, the apical cells of lamellae mostly differentiated, oblong-ovate or broadly rounded, rarely rounded, smooth or finely papillose, lamellae rarely absent; cells at leaf shoulders unistratose, hyaline, rectangular or semi-rectangular. Autoicous or dioicous. Perichaetial leaves slightly different, leaf sheathing bases longer than leaf blades. Perigonia discoid, terminal, with many antheridia and paraphyses; new perigonial shoots formed successively in a series on the same stem annually. Setae rigid, usually 2–3 cm long, rarely longer than 3 cm, smooth; capsules cylindrical to narrowly ovoid, not angled or sometimes 6–8 weakly ridged; stomata lacking; without a hypophysis or hypophyses inconspicuous; exothecial cells hexagonal, usually mammillose; annuli none; opercula beaked; peristome teeth usually 32, lingulate, obtuse; incurved above. Calyptrae cucullate, densely hairy. Spores minute, smooth.
 
 
 
 

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l. Protonemata persistent; leaves small and appressed on stems, without lamellae.....................................2
l. Protonemata not persistent; leaves large and clasping stems with a sheathing base; lamellae numerous........ 3
2. Costa stout, setulosely aristate, coarsely spinose above..........................................16. P. spinulosum
2. Costa slender, disappearing at leaf apex, smooth.....................................................2. P. camusii
3. Lamellae present only on ventral surface or lateral sides of the costa.................................................4
3. Lamellae densely covering the upper part of leaves except at margins................................................5
4. Plants rather robust, up to 8 cm high; leaf apices broad; margins grossly toothed; lamellae only on the ventral surface of the costa.................................................................................................. 15. P. proliferum
4. Plants slender, only 2 cm high; leaf apices narrow; margins serrulate; lamellae on ventral surface and lateral sides of the costa................................................................................................... 12. P. nudiusculum
5. Apical cells of lamellae double, flask-like.................................................................9. P. microstomum
5. Apical cells of lamellae single or sometimes double, but not flask-like....................................................6
6. Plants usually only 5 mm high; apical cells of lamellae 1–2................................................10. P. minus
6. Plants usually more than 2 cm high; apical cells of lamellae mostly single, rarely 2...............................7
7. Leaf margins mostly bistratose, occasionally unistratose....................................................................8
7. Leaf margins always unistratose.....................................................................................................12
8. Lamellae mostly 4–5 cells high, apical cells usually double, smaller than other cells of lamellae.......... 9
8. Lamellae mostly (1–)2–4 cells high, apical cells single, similar to other cells of lamellae................... 10
9. Plants usually 8 cm high or higher; leaves lanceolate..........................................13. P. pergranulatum
9. Plants less than 8 cm high; leaves narrowly lanceolate.........................................8. P. japonicum
10. Sheath-margins remotely dentate, wide, mostly unistratose except at outermost margins; lamellae more or less crenate as seen in side view, mostly 2–3(–4) cells high................................ 4. P. contortum
10. Sheath-margins serrate, narrower, mostly bistratose; lamellae mostly straight as seen in side view, usually 1–2 cells, sometimes up to 4 cells high......................................................................................... 11
11. Plants larger, up to 8.0(–10) cm high; leaves up to 1.0 cm long; lamellae 1–2 cells high with apical cells partially in pairs; leaf margins typically bistratose........................................... 3a. P. cirratum subsp. cirratum
11. Plants smaller, only up to 3.0 cm high; leaves less than 0.5 cm long; lamellae sometimes up to 4 cells high with apical cells not in pairs; leaf margins typically unistratose.................... 3b. P. cirratum subsp. fuscatum
12. Margins of the sheathing base ciliate.....................................................6. P. fastigiatum
12. Margins of the sheathing bases entire......................................................................................13
13. Apical cells of lamellae usually yellowish brown, distinctly thick-walled.........................................14
13. Apical cells of lamellae not yellowish brown, not distinctly or rarely thick-walled above.......................... 16
14. Apical cells of lamellae oblong-oval....................................................................18. P. urnigerum
14. Apical cells of lamellae transversally rectangular.................................................................................15
15. Costa aristate; apical cells of lamellae smooth.....................................................14. P. perichaetiale
15. Costa not aristate; apical cells of lamellae densely papillose.................................5. P. dentatum
16. Leaf lamellae on the ventral surface disappearing at 5–7 rows of marginal cells; lamellae 3–4 cells high
...............................................................................................................17. P. subfuscatum
16. Leaf lamellae densely covering nearly entire ventral surface, lamellae 3–6 cells high......................... 17
17. Leaves strongly crisped when dry; the width of apical cells of lamellae larger than length, emarginate above in cross section..............................................................................................7. P. inflexum
17. Leaves usually incurved when dry; the length of apical cells of lamellae larger than width, not emarginate above in cross section......................................................................................................................18
18. Apical cells of lamellae in cross section mostly elliptic, sometimes finely papillose..........11. P. neesii
18. Apical cells of lamellae in cross section rounded or rounded-oval, smooth......................1. P. aloides
 

 

 
 
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