I. Algae of class Phaeophyceae includes {Sargassum} – Correct. II. {Marchantia} belongs to Hepaticopsida, a class of Bryophytes – Correct. III. {Equisetum} is a pteridophyte but not from class Pteropsida – Incorrect. IV. {Pinus} belongs to Coniferopsida, not Gnetopsida – Incorrect.