Question

Filicales are classified on the basis of

• A. Sori
• B. Nature of spores
• C. Nature of sporophyll and sporangia
• D. Nature of annulus

Answer 1

Answer: (A)

Sori

Linnaeus, based on the position and structure of sori (did not consider the presence or absence of indusium), grouped the pteridophytes under the order filices of class cryptogamia. He described 17 genera and 213 species of pteridophytes with ferns having 14 genera and 182 species. He treated Equisetum, Marsilea, Pilularia and Isoetes as 'fern allies'.

Therefore, the correct answer is option A.