Was giant tree fern living in the early pennsylvanian 325 million years ago 属大型蕨木生长于宾夕法尼亚纪早期约三亿二千五百万年前。
It is an area of lush green meadows and groves of towering ancient trees , as well as rare plants such as dove trees and tree ferns :位于大足县东南边陲,为省级森林公园。林区浓荫覆盖,古木参天。
The variety of plant life found within the park include agathis , mountain ru , tree ferns , different species of orchids and begonia 公园气候炎热潮湿,雨量丰沛,使之成为一座巨大的天然热带植物园动物园
They are classified into 6 ecological types : terrestrial ferns , tree ferns , epiphytic ferns , vine ferns , aquatic ferns and rock ferns according to their growth localities 蕨类植物按生长的地理位置可分为陆生蕨类、树蕨类、附生蕨类、藤本蕨类、水生蕨类、石生蕨类。
What is more , some of the pollen grains and spores i found in the clays and lignites came from conifers and tree ferns that could have grown only at the high altitudes of a mountain range 而且我在黏土及褐煤中发现的花粉粒与孢子,属于针叶树及树蕨,它们只生长在高海拔的山区。
英文解释
any of numerous usually tropical ferns having a thick woody stem or caudex and a crown of large fronds; found especially in Australia and New Zealand; chiefly of the families Cyatheaceae and Marattiaceae but some from Polypodiaceae