卷叶薄齿藓和北美赤藓形态特征及其地理新分布

通过对采自贵州省梵净山和内蒙古赛罕乌拉自然保护区的苔藓植物标本进行鉴定,发现了丛藓科的2个新分布种——卷叶薄齿藓(Leptodontium pungens)和北美赤藓(Syntrichia amphidiacea)。卷叶薄齿藓为中国新记录种,首次在中国贵州省梵净山发现,其主要特征为茎无中轴分化,具透明层,常分布于火山和温带高海拔地区。北美赤藓为内蒙古新分布种,发现于内蒙古赛罕乌拉自然保护区,其主要特征为叶腹面近叶尖处生有大量芽胞,成熟芽胞棕色,多细胞,圆柱状。本研究对卷叶薄齿藓和北美赤藓的形态特征和地理分布进行了具体描述,并提供了图版和分种检索表。

Morphological Characteristics and Geographical Distribution of Leptodontium pungens and Syntrichia amphidiacea (Pottiaceae)

Based on detailed collection and identification of bryophytes,we discovered two new geographic distribution records of Leptodontium pungens and Syntrichia amphidiacea.L.pungens is discovered in China for the first time.It is superficially well distinguished by the hyaline layer.More constant features include the absence of a stem central strand and a differentiated epidermis over the costa.Frequently collected on volcanos and páramos at high altitudes,mainly distributed in Mexico,Central American,Andes,Juan Fernandez,southern Brazil and Africa.S.amphidiacea was firstly found in Inner Mongolia.The peculiar character of this species is that there are abundant cylindrical gemmae on the dorsal and ventral surfaces of leaf apices.The species has been reported from Eastern North America,Mexico,Central America and Guizhou Province of China.Morphological characteristics and geographical distribution of L.pungens and S.amphidiacea are discussed.Meanwhile the illustrations are provided.The present study increased the basic data of Chinese moss flora.