蕨類 Ferns
The spires of the fern, mostly curly, provide the simplest means of identification. Ferns are cryptogams, bearing bundles within. They do not blossom, bearing neither fruit nor seeds. Since they don't have distinct stalks, leaves become their most obvious feature. Their leaves are normally bigger than with other plants, enabling them to capture more sunlight even if growing under the shadow of "mainstream" plants in the forest. Sporangium clusters can be seen on the back of a mature fern leaf. The spores, a fern's major productive and spreading tools, are distinctively different from the seeds of advanced vegetation; i.e., a spore is as big as a single cell, which is invisible to the naked eye. The sporangium clusters on the back of mature fern leaves are hence another distinctive feature used for fern identification.