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Published In: Annales Botanici Fennici 5(2): 145–147, f. 14–15, 20, 31–32, 35–36, 41, 43, 44, 47, 60, 69, 78, 81, 98, 100. 1968. (Ann. Bot. Fenn.) Name publication detail
 

Project Name Data (Last Modified On 3/18/2009)
Acceptance : Accepted
Project Data     (Last Modified On 3/18/2009)
General Reference:

Notes     (Last Modified On 3/18/2009)
general taxon notes:
There are some 25 species of the genus in the world (Crosby et al. 2000). Studies on the Chinese species of the genus by Koponen (1972, 1975, 1994) are helpful to this treatment. Seventeen species are recognized in China.

 

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5. Plagiomnium T. Kop.   匐灯藓属   fu deng xian shu

Ann. Bot. Fenn. 5: 145. 1968.
 
Plants rather large, mostly pale green, in large mats or loose tufts. Stems prostrate, with many creeping branches or flagelliform branches; creeping branches curved, with dense rhizoids; fertile branches erect, lower leaves small, scale-like; upper leaves large, often forming rosettes at top of stems; flagelliform branches usually with larger leaves in the middle, smaller ones at base or tips, ovate, obovate, oblong-elliptical or ligulate, crisped or twisted when dry, spreading when moist; leaf base narrowed, decurrent, acute or obtuse at apex; margins often bordered by 1–4 rows of elongate cells, entire or serrate; costae single, percurrent or ending below the apex; leaf cells pentagonal to hexagonal, rarely rectangular or rhombic, sometimes rounded, often thick-walled at corners. Dioicous or autoicous. Sporophytes similar to those of Mnium.
 
 

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1. Marginal teeth of leaves sharp and large, 2 or multicellular; opercula not rostrate........................ 2
1. Marginal teeth of leaves blunt and small, usually unicellular; opercula rostrate..................................5
2. Leaves narrowly elliptical or oblong-lanceolate; costae percurrent...................................................3
2. Leaves broadly obovate or rounded-oblong; costae ending below the apex........................................4
3. Leaves narrowly oblong-lanceolate; margins serrate throughout; leaf cells nearly elliptical, irregularly arranged.......................................................................................................2. P. arbuscula
3. Leaves narrowly elliptical or oblong; margins serrate above the mid-leaf; leaf cells hexagonal, regularly arranged.................................................................................................... ...16. P. venustum
4. Leaves oblong or nearly rounded; leaf cells rounded-quadrate, irregularly arranged........ 5. P. drummondii
4. Leaves broadly obovate or elongate-obovate; leaf cells hexagonal, regularly arranged....... 9. P. japonicum
5. Leaves oblong, rounded-elliptical, ovate or ligulate; leaf apices obtuse, truncate or apiculate..............6
5. Leaves ovate, obovate, elliptical or oblong-lanceolate; leaf apices acute or cuspidate.......................10
6. Juxtacostael cells with 1 row of the cells hyaline, distinctly larger than adjacent cells.......10. P. maximoviczii
6. Juxtacostael cells without any hyaline cells, not particularly larger than adjacent cells............................... 7
7. Leaves rounded-elliptical or ovate, scarcely undulate, obtuse at apex; margins bordered by 4–6 rows of elongated cells........................................................................17. P. vesicatum
7. Leaves narrowly oblong or ligulate, undulate, rounded-truncate at apex; margins hardly bordered or bordered by (1–)3–4 rows of rectangular or elongate cells................................................................................. 8
8. Leaf margins hardly bordered or only at base bordered by 1–2 rows of more or less rectangular cells; costae ending below the apex................................................................6. P. elimbatum
8. Leaf margins bordered by 3–4 rows of elongated cells; costae percurrent....................9
9. Leaf bases decurrent; leaf cells ca.10–25 µm in diameter.............................12. P. rhynchophorum
9. Leaf bases not decurrent; leaf cells ca. 30–50 µm in diameter......................13. P. rostratum
10. Leaves typically elliptical; margins bordered by 4–8 rows of narrowly elongate cells...... 7. P. ellipticum
10. Leaves broadly ovate, oblong or ovate-lanceolate; margins bordered by 2–4 rows of elongate cells..... 11
11. Costae ending below the apex.................................................................................12
11. Costae percurrent...................................................................................................13
12. Leaves rounded-ovate or obovate, decurrent at base..............................3. P. confertidens
12. Leaves broadly elliptical or broadly ovate, not decurrent at base..............14. P. succulentum
13. Leaves broadly ovate or ovate-lanceolate; leaf cells isodiametric, ca. 20–35 µm wide...............14
13. Leaves broadly elliptical or oblong-elliptical; leaf cells hexagonal-elliptical, ca. 40–70 µm × 25–45 µm 15
14. Leaves mostly light green, shiny, elliptical or narrowly obovate; leaf cells hexagonal, walls not thickened at corners.......................................................................................................................... 1. P. acutum
14. Leaves mostly dark green, dull, elliptical or ovate; leaf cells rounded-hexagonal, walls thickened at corners.........................................................................4. P. cuspidatum
15. Leaf margins entire, indistinctly bordered..................................................8. P. integrum
15. Leaf margins serrate, distinctly bordered..................................................16
16. Leaf apices acute; marginal teeth short, blunt; cell walls not or indistinctly porose............ 11. P. medium
16. Leaf apices obtuse to mucronate; marginal teeth long, sharp; cells walls distinctly porose.....15. P. tezukae
 

 

 
 
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