Asia branches common feature epiphytes epiphytic ferns fern species ferns host trees leaves limbs non-parasitic rainforests Roots spores stems trees tropical tropical trees trunks variations variety epiphyte epiphytic fern green natural nature new zealand palm plant trunk china Hainan jungle pteridophyte angles Begonias bromeliads cascading cloud-forest color colorful colors colour colourful conservatory creepers decorative delicate-ferns dense density distinctive dome ecological ecology environmental flora flowers foliage gardening gardens greenery greenhouse greening hanging height high highrise lush-vegetation orchids plantings plants Singapore tropical-highlands tropical-mountains vertical vertical-gardening vertical-gardens vines wall-garden