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Which lycophyte groups produce only one kind of spore?
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Lycophyte
Club moss (Lycopodium annotinum).
Lycophyte groups that produce only one kind of spore are referred to as homosporous. Within the lycophytes, members of the family Lycopodiaceae, which includes the genus Lycopodium (club mosses), are homosporous.12
These plants produce morphologically identical spores that germinate to develop into bisexual or unisexual gametophytes. This contrasts with other extant lycophyte genera, such as Selaginella (spike mosses) and Isoetes (quillwort), which are heterosporous and produce two distinct types of spores: larger megaspores and smaller microspores.21