Zeploon

The zeploon split from its ancestor the balloon bubbleweed. It now free floats in the atmosphere. Its bubbles have become huge to support its weight. Its trunk, branches and roots have become hollow to reduce weight. Its roots have developed feathery bristles to filter-feed the microbes in the atmosphere as well as collect water. Like its ancestor, it produces hydrogen filled bubbles as well. It also gets energy from its photosynthetic leaves that hang off its branches.