definition of psilopsida lycopsida sphenopsida pteropsida and spermopsida
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- Pallopsida - a subdivision of Tracheophyta comprising vascular plants with no roots, leaves only partially differentiated or lacking, no leaf traces, a usually protostelic vascular cylinder, and the sporangia merely terminal enlargements of the stem — compare lycopsida , pteropsida , sphenopsida.
- Lycopsida - a class of pteridophyte plants that comprises the clubmosses and their extinct relatives.
- Sphenopsida - a class of pteridophyte plants that comprises the horsetails and their extinct relatives.
- Pteropsida - Is a subdivision of vascular plants that is no longer in use. It includes all flowering plants and ferns and is divided into Filicinae, Gymnospermae, and Angiospermae.
- Spermicide - a substance that kills spermatozoa, used as a contraceptive.
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what is infloresence?explain its types
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