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題 名 | A Reassessment of the Taxonomic Position of Miehea Ochyra=米氏蘚的分類地位再評估 |
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作 者 | 蔣鎮宇; | 書刊名 | Botanical Bulletin of Academia Sinica |
卷 期 | 39:2 1998.04[民87.04] |
頁 次 | 頁131-136 |
分類號 | 378.21 |
關鍵詞 | 米氏蘚; 擬摺葉蘚; 薄羅蘚科; 分類地位; 鱗毛的發育序列; 蒴齒; Leskeaceae; Miehea; Ontogenetic transformations; Peristomes; Pseudopleuropus; Taxonomic position; |
語 文 | 英文(English) |
中文摘要 | 米氏蘚的分類地位極具爭議性,尤其在其模式種喜馬拉雅米氏蘚被認為是印度塔 蘚之異名後,米氏蘚抑或被置於塔蘚科或被認定是羽蘚科叉鱗毛蘚屬的異名;本研究在重新 檢視米氏蘚的分類群,根據鱗毛的發育序列,將米氏蘚合併到擬摺葉蘚屬;印度米氏蘚與喜 馬拉雅米氏蘚有很多形態上之差異,包括無性的芽胞及尾狀的莖葉先端,本文共認定三種擬 摺葉蘚,即玉山擬摺葉蘚,印度擬摺葉蘚及喜馬拉雅擬摺葉蘚,根據孢蒴的特徵,擬摺葉蘚 應屬薄羅蘚科植物,本屬與多毛蘚屬近緣,都具有分化的莖枝葉,內凹的葉片及披針形的葉 細胞。矮雄體在玉山擬摺葉蘚的分化可能代表侵入(由地生到附生)新的適應空間的關鍵特 徵。 |
英文摘要 | The taxonomic position of Miehea Ochyra has remained questionable since the type species M. himalayana Ochyra was synonymized into Hylocomium indicum Dixon, which was either treated as Miehea in the Hylocomiaceae or as a Ptychodium of the Thuidiaceae. In this study I re-examine the Miehea taxa and synonymize them to Pseudopleuropus Tak. based on the ontogenetic sequence of paraphyllia as well as other morphological characters of gametophytes. Miehea indica appears distinct from M. himalayana by having asexual gemmae and caudate apex of stem-leaves. Three species in Pseudopleuropus are recognized, i.e., P. morrisonensis Nog., P. indicus (Dix.) comb. nov., and P. himalayanus (Ochyra) comb. nov. Miehea (=Pseudopleuropus) is catalogued in the Leskeaceae and excluded from the Hylocomiaceae or Thuidiaceae based on the leskeoid peristomes (vs. hypnoid ones) and the unbranched paraphyllia. Pseudopleuropus is related to Lescuraea in sharing several gametophytic characteristics: differentiation of stem- and branch-leaves, concave leaves, and lanceolate laminal cells. The differentiation of dwarfness, an autapomorphy in P. morrisonensis, is suggested to be a key innovation for adapting to the selective regime switching from terrestrial to corticolous habitat. |
本系統中英文摘要資訊取自各篇刊載內容。