List four classes of plants belonging to the fern group.
Pteridophytes or fern groups are divided into four classes: (i) Class 1: Psilopsida . Example- Psilotum nudum (ii) Class 2: Lycopsida. Example- Lycopodium phlegmasia (iii) Class 3: Sphenopsida. Example- Equisetum (iv) Class 4: Pteropsida. Example- Adiantum and Pteridium
Pteridophytes or fern groups are divided into four classes: (i) Class 1: Psilopsida . Example- Psilotum nudum (ii) Class 2: Lycopsida. Example- Lycopodium phlegmasia (iii) Class 3: Sphenopsida. Example- Equisetum (iv) Class 4: Pteropsida. Example- Adiantum and Pteridium
