The Gardeners' chronicle : a weekly illustrated journal of horticulture and allied subjects . The Betinosporas affordsimilar illustrations; and we know that thatparticular phase of vegetation can be perpetu-ated by cuttings, and remain in the same con-dition for an indefinite time. One of the moststriking illustrations of alternation is affordedin the reproduction of Ferns. The spores do notimmediately reproduce the plant, but they fall off,as many buds do, and, under propitious circum-stances, they develop a flat, green plate (the pro-thallus), on which are formed the antheridiaand the archeg
The Gardeners' chronicle : a weekly illustrated journal of horticulture and allied subjects . The Betinosporas affordsimilar illustrations; and we know that thatparticular phase of vegetation can be perpetu-ated by cuttings, and remain in the same con-dition for an indefinite time. One of the moststriking illustrations of alternation is affordedin the reproduction of Ferns. The spores do notimmediately reproduce the plant, but they fall off,as many buds do, and, under propitious circum-stances, they develop a flat, green plate (the pro-thallus), on which are formed the antheridiaand the archegonia, bodies corresponding re-spectively to the anthers and to the ovaries offlowering plants. It is customary to considerthe frond of a Fern, with its spores, as belong-ing to one generation ; the prothallus, with itstwo kinds of sexual organs, as representinganother generation—the frond being called the sporophore, the prothallus the either the existence of the plant wouldbe incomplete; but of the two, the vegeta-tive or sporophore phase is obviously the FlQ. 92.—PINPS PARRYANA. itterei primordial leives and tufted permanent eaves.)
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Keywords: ., bo, bookdecade1870, booksubjectgardening, booksubjecthorticulture
