There are over one hundred species of plants including oak, royal fern and rowan trees. More moist areas are home to marsh pennywort and royal fern rhododendron and sycamore. Seasoned royal fern is also used in the dish Namul in Korean royal court cuisine. Rare plants include&colon; royal fern, sea spleenwort and sea purslane. Vegetable ingredients include mung bean sprouts, Asian royal fern, scallions, napa cabbages, and mustard greens. His Royal Fern Corporation was chartered in 1922 with an authorized capital of $450,000. Rare ferns present include marsh fern ("Thelypteris palustris") and royal fern ("Osmunda regalis"). The Sellenbruch conservation area, on the other hand, also harbours widespread royal fern growth. The sterile (vegetative) fronds resemble in form, another relative, "Osmunda regalis" (Royal fern).