Global ETD Search
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Showing 1 to 3 of 3 for “"fern spores"”.
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Palynology of the Springfield Coal of the Illinois Basin (Middle Pennsylvanian) with quantitative comparison of spore floras and coal-ball peats and implications for paleoecological studies
Spores and coal balls from profiles in the Springfield Coal of the Illinois Basin were analysed to determine how quantitative spore floras can be used in paleoecological interpretations of Pennsylvanian-age coals. Laterally extensive sampling of spore profiles also was designed to evaluate lateral …
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The Control of Spore Germination in Anemia Phyllitidis (L.) Swartz and Other Ferns
<p>Many fern spores require light for germination. In one family of ferns, the Schizaeaceae, the gibberellins overcome this light requirement and induce dark-germination. Fern gametophytes produce antheridium-inducing substances. The Anemia substance, antheridogen-B, is demonstrated to induce …
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Thresholds for sustainable regeneration in urban restoration plantings in Hamilton City, New Zealand
… vegetation. Seed rain, soil seed banks (fern spores inclusive) and understorey vegetation in urban forest were found to have higher exotic species richness and lower native species density and richness than rural forest. Both understorey vegetation and soil seed banks of urban sites >20 …