?山毛榉蕨

...beech fern:Either of two woodland ferns with deeply cut triangular blades, Thelypteris hexagonoptera of eastern North america and T. phegopteris of North america and Eurasia."山毛榉蕨:带有深切口的三角形叶片的两种林地蕨,北美东部的六方沼泽蕨及北美和欧亚大陆上的鳞毛沼泽蕨。