| 释义 |
‖ sphagnum Bot.|ˈsfægnəm|
Pl. sphagna, -ums.
[mod.L. (J. J. Dillenius Hist. Muscorum (1741) 240), f. Gr. σϕάγνος a kind of moss.]
1. A genus of mosses growing in boggy or swampy places; bog-moss, peat-moss; also, one or other of the species or plants composing this genus.
1741J. J. Dillenius Hist. Muscorum 240 The larger soft and hollow-leaf'd Bog Sphagnum. 1753Chambers' Cycl. Suppl. s.v., The sphagna are divided into two orders, the one comprehending the branched kinds, and the other the unbranched ones. 1839Lindley Introd. Bot. (ed. 3) 547 The only case of undoubtedly perforated parenchyma with which I am acquainted is in Sphagnum. 1857Henfrey Bot. 443 The Sphagna have antheridia like those of Jungermannia. 1880Bessey Botany 351 The adult plant-body in this class, which includes, besides the Sphagnums, all the true Mosses, is always a leafy stem.
attrib.1839Lindley Introd. Bot. (ed. 3) 547 The circular spaces in Sphagnum leaves are openings. 1857T. Moore Handbk. Brit. Ferns (ed. 3) 27 On this a thin layer of sphagnum moss should be spread.
2. The mossy substance of which plants of this genus are composed.
1840Florist's Jrnl. (1846) I. 208 Covered over with dry sphagnum, or bog moss. 1863Lyell Antiq. Man 9 The lowest stratum consists of swamp-peat composed chiefly of moss or sphagnum. 1877W. H. Dall Tribes Ext. N.W. 80 A saucer or dish of stone or clay, with a wick, usually of sphagnum.
3. Special Comb.: sphagnum bog, swamp, a bog in which the plant-life consists chiefly of mosses of the genus Sphagnum.
1911C. B. Crampton Vegetation Caithness iv. 51 In recent times..Sphagnum bogs have been reduced to their present small proportion in the moorland associations. 1951V. Nabokov Conclusive Evidence iv. 47 Beyond the lower course of the river..the vast expanse of a misty-blue sphagnum bog. 1972Dean & Smith Wisconsin 78/2 Sphagnum bogs are one stage in the succession from open-water lake to conifer swamp.
1890Science-Gossip XXVI. 60 In the far-off bogs and sphagnum swamps of North Wales. 1941J. Buchan Sick Heart River ii. 124 A bottomless half-frozen sphagnum swamp..heaved under his tread. |