Hawaiian Forest Fungi. I. A New Species of Phyllachora on the Tree Fern Cibotium glaucum
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SUMMARYA new species of Phyllachora, P. cibotii, characterized by perithecia borne in well-developed linear stromata that occur only on frond stipes, is described from the endemic tree fem Cibotium glaucum in Hawaii.Keywords:
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Our knowledge of the phenomena of irritability in vascular plants is largely confined to Angiosperms. Very little work seems to have been done on Pteridophytes; and from his few observations on fern fronds, Darwin [(1), p. 509] even doubted if they possessed any power of response to gravity. In a preliminary account (4) of the distribution of the statolith apparatus in plants, I mentioned that it was present in young fern fronds, and I have since found that this was partially known to Dehnecke (3). He referred to fern fronds as possessing non-assimilating chlorophyll grains resting on their physically lower cell walls; but he did not connect these grains with the perception of gravity, nor, so far as I am aware, have they ever been photographed or indeed noticed since.
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Stenochlaena riauensis, a new fern species from Riau, Indonesia is described and illustrated. This species can be distinguished from its most closely related species S. palustris by the position of fertile and sterile pinnae. In the new species, both fertile and sterile pinnae are located on the same frond, the lower part of lamina consisted of sterile pinnae that gradually narrower towards apex forming linear fertile pinnae.Bangladesh J. Plant Taxon. 22(2): 137-141, 2015 (December)
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Preview this conference paper: Interpreting the Molecular Record in Extraordinarily Preserved Concretion Fossils: Mimicking Microbial Fossilisation of Modern Gingko Leaves and True Fern Fronds, Page 1 of 1 < Previous page | Next page > /docserver/preview/fulltext/2214-4609/2023/imog-2023/149-1.gif
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The following note attached by the writer to sheet number 7084 of Dr. Jennings' Ontario collection may be of sufficient interest to warrant its publication in the Fern Journal. The fern in question was collected August 19, 1914, on a steep diabase cliff on the south shore of north Ombabika peninsula, Lake Nipigon, Ontario. Dryopteris fragrans (L.) Schott. (7084). This is a very remarkable plant in that it has about 120 (counted as accurately as possible without destroying the planta few did drop off) dead fronds and 10 mature live fruiting fronds-130 in all at the time of its collection. The five other specimens of this species collected on the present expedition show 5, 7, 9, 4, and 6 green fronds respectively, an average of about seven green leaves to the plant including the first plant. Using this figure as the basis of the average annual leaf production, some of these dead fronds are at least 17 years old and the whole plant 18 years old. If it produced 10 fronds annually, they are 12 years old and the whole plant 13 years old. From these figures it seems perfectly reasonable to conclude that the oldest set of dead fronds is at least 15 years old. But this is not all. The rootstock is about 12 centi-
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SYNOPSIS Fronds of the fern Rumohra adiantiformis are picked in the southern Cape forests and exported. Harvested fern rhizomes produce smaller fronds. Recruitment of juvenile plants to a marketable size class, and recovery in frond size of experimentally defoliated fern rhizomes is slow, no net increase in the size of new fronds having been observed over 34 months. Rhizomes extend horizontally 10 mm to 250 mm per year just below the litter layer, and it is possible that this is an adaptation to patchy and low availability of light or nutrients on the forest floor. The fern can respond to fertilisation and is 20 times more productive under nursery conditions than in the wild. Natural R. adiantiformis populations appear unable to maintain their quality when harvested but nursery production of fronds may offer a viable alternative for fern exporters.
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Two greenhouse studies (1990 and 1991) were conducted to evaluate the effect of dikegulac (Atrinal) and benzyladenine (ProShear) on frond initiation and vegetative growth of Boston fern ( Nephrolepis exaltata L.). Four weeks after transplanting, fern liners were sprayed with aqueous solutions of dikegulac and benzyladenine (BA). Chemical concentrations of dikegulac were 0, 250, 500, or 750 mg·L –1 and those of BA were 0, 50, 100, or 150 mg·L –1 . The effect of dikegulac and BA on number of shoots, frond length, leaf area, and dry weight were measured. Dikegulac stimulated shoot initiation and increased leaf area and dry weight without affecting frond length. BA reduced frond length and its effect on shoot initiation, leaf area and dry weight varied from one time to another. This study suggests the potential use for dikegulac in improving the appearance and aesthetic quality of Boston fern.
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