Cogon grass, Nipa palm leaves and coconut fronds are used as roof thatching. The plants are unusual in being ferns with simple, undivided fronds. They produce coiled fiddleheads that uncoil and expand into fronds. This genus includes many showy members, their elongate shells highly sculptured with spines or fronds. Beneath the city's seal are crossed palm fronds and orange branches. Solitary bats prefer to live in leaves, palm fronds and Spanish moss. These lovebirds prefer older neighborhoods where they nest under untrimmed, dead palm tree fronds. It is cultivated on dangling cords made of palm fronds. Affected fronds and leaflets are stunted and leaflets dry up. Spores develop in sori on the underside of the fronds. It appears initially as whitish-yellow mottling of younger fronds. Staghorns can be propagated by spores produced on the underside of the fertile fronds. Tender palm fronds symbolize spiritual power and are objects of sacred power. Both fronds and rhizomes have been used to brew beer. The bundle is held together with rings made from strips of palm fronds.