Bryum marratii Hook. & Wilson (Bryaceae, Musci) reported new to China
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摘要:
本文首次报道了马氏真藓(Bryum marratii Hook. & Wilson)在中国的分布。该种的主要识别特征为:植株鲜绿色;叶卵形至卵状椭圆形,强烈内凹、钝尖,边缘平直、不分化,中肋不及顶;孢蒴梨形,蒴盖具短喙。马氏真藓在中国主要分布于西藏阿里地区西南部高海拔地区,偶见于日喀则,多生长于高寒水体或季节性水体堤岸土壤。与世界其他地区同种物种相比,该新分布种植株矮、蒴柄短,叶和叶细胞较小;文中还比较了该新分布种与相似物种的主要形态识别特征。由于马氏真藓居群数量少,且破碎化分布,建议将该种列为中国受保护物种。
Abstract:Bryum marratii Hook. & Wilson is reported new to China. The species is distinguished by the following characters: plants bright green, leaves strongly concave, apex obtuse, margins plane, border lacking, costae ending well below apex; pyriform capsule with rostellate lid. In China, the newly recorded species is mainly distributed in the southwestern Ngari region, occasionally in Shigatse of Tibet, mostly in soil banks of alpine or seasonal water bodies. The B. marratii populations in China differ from those in other areas by smaller plant size, shorter setae, and smaller leaves and leaf cells. The principal distinctive characters that separate B. marratii from similar species within the genus Bryum are discussed. Given the small population size and habitat fragmentation, B. marratii should be classified as a threatened species in China.
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图 1 马氏真藓显微形态结构图
A:可育株;B:孢蒴;C:营养株;D ~ I:叶;J:雌器苞;K:雌苞叶;L:雄器苞;M:雄苞叶。(凭证标本:邵小明&宋晓彤2019P150Y001)。
Figure 1. Morphological characters of Bryum marratii
A: Fertile plant; B: Capsule; C: Sterile plant; D – I: Leaves; J: Perichaetium; K: Perichaetial leaf; L: Perigonium; M: Perigonial leaf. (Voucher specimen: Shao Xiao-Ming & Song Xiao-Tong 2019P150Y001).
图 2 马氏真藓显微形态结构图
A:叶上部细胞;B:叶中部细胞;C:叶基部细胞;D: 假根;E:茎横切。(凭证标本:邵小明&宋晓彤2019P150Y001)。
Figure 2. Morphological characters of Bryum marratii
A: Upper leaf cells; B: Medial leaf cells; C: Basal leaf cells D: Rhizoid; E: Transverse section of stem. (Voucher specimen: Shao Xiao-Ming & Song Xiao-Tong 2019P150Y001).
表 1 马氏真藓与相似种的比较
Table 1 Comparison between Bryum marratii and similar species
物种
Species植株颜色
Plant
color叶形
Leaf
shape叶面平展/
内凹
Leaf flat
or concave叶尖
Leaf
apex叶缘平直/
背卷
Margin plane
or revolute分化边
Leaf
border叶中上部
细胞形状
Upper and
median leaf
cell shape中肋
Costa性别
Sexuality孢蒴
Capsule芽胞
Filiform
gemmae马氏真藓
Bryum marratii鲜绿色 卵形至卵状椭圆形 强烈内凹 钝尖,少数叶有短急尖 平直 无 长菱形、六边形,长宽比 < 3∶1 消失于叶尖下 雌雄同株 梨形,蒴盖有短喙 无 卵叶叶真藓
Bryum calophyllum浅橄榄绿色、棕黄色或微红色 卵形或卵
圆形− − 下部背卷 明显 − 达叶尖 − 长卵状,蒴盖圆锥形 − 圆叶真藓
Bryum cyclophyllum浅绿色或黄绿色 卵圆形或
圆形平坦或微凹 圆钝 平直或基部稍背卷 不明显 − − 雌雄异株 圆柱形,蒴盖有短喙 偶见 喀什真藓
Bryum kashmirense绿色或黄
绿色长圆状
卵形− 渐尖 − − 狭长菱形,
长 : 宽 ≈ 5∶1贯顶至
短出雌雄异株 梨形,蒴盖圆锥形 − 注:−表示该项特征与马氏真藓相同。 Note: − indicates character is the same as that of Bryum Marratii. -
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