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Leucobryum Hampe 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: Linnaea 13: 42. 1839. (Linnaea) Name publication detailView in BotanicusView in Biodiversity Heritage Library
 

Project Name Data (Last Modified On 3/10/2009)
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Notes     (Last Modified On 3/10/2009)
general taxon notes:
Leucobryum is a group of whitish to grayish looking mosses that are often found growing on acid substrates. The genus is often used to differentiate various types of forest vegetation in lowland coniferous-broadleaf forests in southern China.
 
There are about 110 species of Leucobryum worldwide, and 19 taxa were recognized in Asia (Yamaguchi 1993). Ten species and one variety are treated from China in this study. We have more or less adopted Yamaguchi's (1993) treatment of Asiatic species. Since he has seen only a few Chinese specimens of Leucobryum, some of the Chinese records may be proved to be synonyms of other species in the future.

 

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2. Leucobryum Hampe   白发藓属 bai-fa xian shu
Linnaea 13: 42. 1839.
 
Plants small to large, sometimes robust, 0.5–20 cm high, whitish, grayish or bluish green, in compact or loose cushions. Stems erect, simple or forked; central strand mostly absent, sometimes present. Leaves crowded, appressed, or erect-spreading, sometimes falcate-secund above, linear-lanceolate to lanceolate or subtubulose from oblong-ovate to elliptic sheathing base, acute to mucronate at the apex, often with rhizoids at leaf tips, upper parts of leaves filled mostly by the multi-layered broad costa, laminae confined to the basal parts of leaves with multi-rowed linear cells; alar cells rarely differentiated; margins entire to slightly serrulate at the apex, ± bordered by linear cells up to the leaf apex; costae thick, broad, consisting of 2–8 layers of enlarged leucocysts enclosing a ± median row of small, quadrangular chlorocysts in cross section near leaf base. Dioicous or pseudoautoicous. Male plants dimorphous, sometimes minute, dwarf male plants growing on tomentum or among leaves of female plants; normal male plants as large as female plants. Perichaetial leaves sheathing at the base, abruptly linear-filiform from shoulders. Sporophytes terminal or lateral. Setae erect, elongate, sometimes clustered; capsules more or less cylindrical, asymmetric, inclined to horizontal, rarely erect, ± ribbed, often strumose; stomata lacking; annuli often absent, 1–2 rows of small cells when present; opercula long-rostrate; peristome teeth 16, divided to the middle, lanceolate with a broad base, vertically striolate below and papillose above on inner surface, papillose or smooth on outer surface. Calyptrae cucullate. Spores small to large, finely papillose.
 
 

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1. Leaves auriculate at base..................................................................9. L. sanctum

1. Leaves not auriculate at base...........................................................................2
2. Dorsal side of the leaf acumina scabrous to spinosely prorate.............................3
2. Dorsal side of the leaf acumina smooth.............................................................8
3. Leaves only scabrous and undulate on dorsal side................ 4. L. chlorophyllosum
3. Leaves papillosely prorate, not undulate or both undulate and prorate on dorsal side............................... 4
4. The dorsal side of leaves papillosely prorate, not undulate..................2. L. boninense
4. The dorsal side of leaves papillosely to spinosely prorate, undulate........................5
5. Plants small; leaves often less than 4.5 mm long.................................................6
5. Plants robust; leaves often more than 6.5 mm (usually 8.0–18.0 mm) long.............7
6. Leaves not spirally arranged, more or less in 5 rows, falcate-secund, not forming conical points at stem apices.........................................1a. L. aduncum var. aduncum
6. Leaves spirally arranged, often closely imbricate, forming conical points at stem apices....................................................................1b. L. aduncum var. scalare
7. Leaves falcate-secund, papillosely prorate on dorsal side..................7. L. javense
7. Leaves erect-spreading, spinosely prorate on dorsal side............... 10.L. scabrum
8. Stems with a central strand.........................................................................9
8. Stems without a central strand..................................................................10
9. Leaves lustrous, linear lanceolate, flexuose or contorted when dry.........3. L. bowringii
9. Leaves not lustrous, lanceolate, straight when dry........................ 6. L. humillimum
10. Leaves more than 1.0 cm long; leucocysts 2-layered at the central parts in cross section near the leaf base..............................................................5. L. glaucum
10. Leaves less than 1.0 cm long; leucocysts in (2–)3–4-layered at the central parts in cross section near the leaf base........................................8. L. juniperoideum

 

 
 
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