According to the textbook:

• A. Microscopic angiosperm: Angiosperms range in size from the smallest Wolffia to tall trees .
• B. Tallest gymnosperm: The giant redwood tree Sequoia is one of the tallest tree species .
• C. Thalloid bryophyte: The plant body of a liverwort (bryophyte) is thalloid, e.g., Marchantia .
• D. Heterosporous pteridophyte: Genera like Salvinia and Selaginella produce two kinds of spores (heterosporous) .