Botanica (Nature Expansion)

Bayou swamps are biomes with jungle trees and 'Bald Cypress Trees' in this mod

These trees have 2 main variations 

They do not have their sapling as of now

Their log has 2 variations a soaked one and dry one

soaked ones naturally spawn

dry ones can be made by putting them on fire 

and these dry logs can be put in water to turn into their soaked variants

Cattails spawn in bayou

swamp biomes

They can be placed on any solid block

Fireflys are not 2 pixels!!

They are mobs that spawn in groups of up to 9 in any biome at anytime

This mod has a lot more to offer but these were some significant ones of which I had pictures of.

This mod also adds sargassum, corn and plastic along with cornstarch etc.