|Mangrove tree trunk covered with leaves|
|Leathery leaves covered with dust|
|Large street trees festooned with ferns|
|Two distinct types of leaves|
|Very young fern growing on a wall|
The mystery was solved when I saw their photo in the book Traditional Uses of Ethnomedicinal Plants of the Chittagong Hill Tracts, it was the oakleaf fern Drynaria quercifolia, a dimorphic epiphytic fern! It is a humidity loving plant, hence the growth of fresh green leaves during the rainy season. By the way, Ripon gave me this book, a very nice present.