Abstract: Before summing up the essential points brought forward in the present paper,it seems desirable at the outset to circumscribe briefly the geographical boundary of the Himalaya.We all know that the Himalaya is an extraordinarily gigantic upheaval of the landmass in the concept of its geographical boudary.It has so far unwquivocally been recognized that the mountain range west of the great bend of the famous Tsangpo Gorge in southeastern Tibet running northwestwardly as far as the eastern boundary of Afghanistan and south of the Karakurun is the Himalaya proper,while the mountain range east of the Tsangpo Gorge remains in controversy as to its status.

Key words: Himalaya-polypodiaceous-concentration

摘要： 在讨论本文主题以前，有必要对喜马拉雅的地理范围首先做一简要说明。大家知道，喜马拉雅是举世闻名的陆地的一个最巨大的隆起。可是，它的地理范围究竟有多大,地质学家和地理学家们尚无一致的意见。不过，有一点是已肯定了的，即它的西北端起自阿富汗的东界和喀喇昆仑以南，向东偏南经过克什米尔、印度西北部、尼泊尔、锡金、不丹，又偏向东北到达我国西藏东南部的藏布（江）大拐弯处，这一段是通常公认的喜马拉雅。藏布江以东的山系算不算喜马拉、它的走向是向东北还是向东南、走得多远等等这一系列的科学问题尚无定论。不过，从植物地理和植物区系的角度看，雅鲁藏布（江）以东、北纬28°30′以南的横断山脉作为喜马拉雅山系的一部分的意见是可取的。

关键词: 喜马拉雅, 水龙骨科, 分布