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• W1963957133 abstract "Sphenomeris with 11 or probably more species, Lindsaea with about 150 species, and Tapeinidium with 17 species, together with their related genera, constitute the Lindsaea-group (Kramer, 1971) or the family Lindsaeaceae (Tagawa & Iwatsuki, 1972). The family is nearly world-wide in moist warm areas, and is characterized by the combination of creeping, so-called lindsaeoid-protostelic or solenostelic rhizomes, uni- or multiseriate scales, simply or compoundly pinnate or rarely simple fronds. The sori are terminal on one to many veins, submarginal or nearly marginal, short or elongate along lamina margin, and indusiate. Spores are trilete, less often monolete. Three sporogenetic and reproductive modes are common in the higher leptosporangiate ferns (e.g., Walker, 1979). One mode involves sexual reproduction and production of 64 haplospores from an archesporial cell in each sporangium through four mitoses followed by meiosis. The other two modes involve agamosporous reproduction and production of 32 diplospores. In the meiotic agamosporous or Dopp-Manton-type, three mitoses and a meiosis occur to produce spores in tetrads, while the mitotic agamosporous or Braithwaite-type involves four mitoses and a modified first meiotic division to produce spores in diads (Manton, 1950; Evans, 1964; Braithwaite, 1964; Lovis, 1977; Walker, 1979, 1985). In the agamosporous modes, diplospore formation is accompanied by non-reduction of chromosome numbers. The cytotaxonomy and reproductive biology of Lindsaeaceae are still controversial and even confusing. Based on gametic chromosome numbers and 32spored sporangia, Kurita & Nishida (1963) assumed that two Japanese species of Sphenomeris, S. chinensis Maxon and S. biflora Tagawa, are agamosporous, and further that S. biflora is a haploid agamosporous fern. Similarly, with 32-spored sporangia, the Japanese species, S. chinensis and S. gracilis (Tagawa) Kurita as well as Lindsaea lucida Bl. (Mitui, 1968, 1973, 1976), were also considered agamosporous. On the other hand, Momose (1967) reported that normal antheridia and archegonia are formed in S. biflora and S. chinensis, showing no evidence for agamosporous reproduction. No cytological evidence is available for the presence or absence of alternation of nuclear phases associated with either sexual or agamosporous reproduction in Lindsaeaceae. The basic chromosome number also has not yet been confirmed for Sphenomeris and related genera, because different or approximate numbers (n = 47, 94, c. 94, c. 100, c. 147) have been reported for S. chinensis from various parts of the world (Manton & Sledge, 1954; Mehra & Khama, 1959; Roy & Pande, 1962; Kurita & Nishida, 1963; Wag" @default.
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• W1963957133 title "Sporogenesis, Reproductive Mode, and Cytotaxonomy of Some Species of Sphenomeris, Lindsaea, and Tapeinidium (Lindsaeaceae)" @default.
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• W1963957133 doi "https://doi.org/10.2307/1547175" @default.
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