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Ferns, which may produce sporophylls that are similar to sterile fronds or that appear very different from sterile fronds. These may be non-photosynthetic and lack typical pinnae, e.g. Onoclea sensibilis. Cycads produce strobili, both pollen-producing and seed-producing, that are composed of sporophylls.
Microsporangia occur in all vascular plants that have heterosporic life cycles, such as seed plants, spike mosses and the aquatic fern genus Azolla. In gymnosperms and angiosperm anthers , the microsporangia produce microsporocytes, the microspore mother cells , which then produce four microspores through the process of meiosis .
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However, genetic analysis has shown Psilotum to be a reduced fern. [6] It is not clear whether leaf gaps are a homologous trait of megaphyllous organisms or have evolved more than once. [1] While the simple definitions (microphylls: one vein, macrophylls: more than one) can still be used in modern botany, the evolutionary history is harder to ...
The only heterosporous ferns are aquatic or semi-aquatic, including the genera Marsilea, Regnellidium, Pilularia, Salvinia, and Azolla. Heterospory also occurs in the lycopods in the spikemoss genus Selaginella and in the quillwort genus Isoëtes. Types of seedless vascular plants: Water ferns; Spikemosses; Quillworts
Seeds of Cycas pectinata are traditionally utilized as a source of starch by indigenous tribes and are eaten raw or roasted in Assam and the bordering region of Meghalaya. Microsporophylls are chewed raw to cure stomach-aches and ulcers. The young microsporophylls are eaten by young men in Meghalaya and Assam to enhance male sexual potency
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