Genera like Selaginella and Salvinia produce two kinds of spores. Such plants are known as : (1) Homosorus (2) Heterosorus (3) Homosporous (4) Heterosporous
Option 2) Based on the number of types of spores produced, pteridophytes can be classified into the following two types: 1. Homosporous - Most pteridophytes are of this type. They produce all spores of similar kind. Example - Dryopteris 2. Heterosporous - Some genera like Selaginella and Salvinia produce two kinds of spores, macro (large) and micro (small) spores.
