. Fresh-water aquaria: their construction, arrangement, and management, with full information as to the best water-plants and live stock to be kept, how and where to obtain them, and how to keep them in health. Aquariums. Fig. 69. Greater Duckweed (Lemna polyrhiza). not at all in Britain. In -winter ttey sink to the bottom of tte water. The Greater Duck- weed (Lemna polyrhiza) (Fig. 69) is rather larger than the rest of the duckweeds. Its fronds or leaves are nearly round, about ^in. in diameter, thiokish, dark green above and pur- ple below, each frond having a number of little roots or fibre
. Fresh-water aquaria: their construction, arrangement, and management, with full information as to the best water-plants and live stock to be kept, how and where to obtain them, and how to keep them in health. Aquariums. Fig. 69. Greater Duckweed (Lemna polyrhiza). not at all in Britain. In -winter ttey sink to the bottom of tte water. The Greater Duck- weed (Lemna polyrhiza) (Fig. 69) is rather larger than the rest of the duckweeds. Its fronds or leaves are nearly round, about ^in. in diameter, thiokish, dark green above and pur- ple below, each frond having a number of little roots or fibres growing from beneath. This is a rare plant. The Thick Duck- weed (Lemna gihha) (Fig. 70) has fronds almost round, about |in. in diameter, bright green in colour, flat above and round beneath. The fronds have only one fibre each. This plant is occasionally found growing with other duckweeds upon still water. The Lesser Duckweed (Lemna minor) (Fig. 71) is the commonest of all: the fronds are small, ovate, light green above and a lighter green below, with one rootlet to each frond. The Ivy-leaved Duckweed (Lemna trisulca) (Fig. 72) is fairly common on lakes and ponds. It is about Jin. long, elliptical, thin, serrated near one end, and of a light green colour. The young fronds grow at right angles to the old ones, and each frond has one Fig. 70. Thick Duckweed (Lemna gibba).. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Bateman, Gregory Climenson. London, L. U. Gill
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectaquariu, bookyear1890
