. Goldfish varieties and tropical aquarium fishes; a complete guide to aquaria and related subjects. Fig. 126. Hair Grass (Life sise) a pleasing shade of light green it makes a contrasting group among otherplants in a large aquarium, but it shows to best advantage in a smallaquarium by itself. It grows from 3 to 8 inches and is native to ponds inthe Middle Atlantic and Southern States. TROPICAL AQUARIUM FLSHPJS 179. Fi(.. 127. PoTAMOGETON DEXSUs {Rcduccd onc-haljFig. 128. Nitell.\ gracilis {Reduced one-third) POTAMOGETON In strong contrast to the foregoing dainty plants is Potamogctondcnsiis,
. Goldfish varieties and tropical aquarium fishes; a complete guide to aquaria and related subjects. Fig. 126. Hair Grass (Life sise) a pleasing shade of light green it makes a contrasting group among otherplants in a large aquarium, but it shows to best advantage in a smallaquarium by itself. It grows from 3 to 8 inches and is native to ponds inthe Middle Atlantic and Southern States. TROPICAL AQUARIUM FLSHPJS 179. Fi(.. 127. PoTAMOGETON DEXSUs {Rcduccd onc-haljFig. 128. Nitell.\ gracilis {Reduced one-third) POTAMOGETON In strong contrast to the foregoing dainty plants is Potamogctondcnsiis, or pondweed. As will be seen from figure 127, these leaves arebroad and robust. In color they are a bright green. This variety is saidto be of European origin but is now common in ponds in the UnitedStates. If established in soil in flat pots it flourishes in a well-lightedaquarium. Pieces collected from the wild may be introduced by fasten-ing into the sand. They present a very attractive appearance and will lastfor quite a time, but should only be regarded as temporary and when theleaves begin to turn yellow should be removed. There are many widelydistributed species of Potamogeton, all looking very attractive in a stateof Nature, especially P. crisp us with curly leaves. They look very tempt-ing, but none seem to survive in the aquarium except P. detisus and thatonly when established just to its liking. 1
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