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Suserup Skov, Midtsjælland
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Amossen, Öland, Sverige
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Skjern Å ved Skjern, Jylland, Danmark
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Aptera, E of Chania, Greece
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Subbæk Vandmølle ved Viborg, Danmark
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Uggerby Strand, Nordjylland, Danmark
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Nørreå, Fladbro, Randers
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Skjern Å, Søndre parallelkanal.
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Nors Sø, NV-Jylland, Danmark
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Sverige, Halland, Grimeton, Skärsjön
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Sardinia
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Dokkedal, Himmerland, Danmark
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Kolding
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Fil Sø, Vindum Skov, Jylland, Danmark
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Botanisk have Århus
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Nørre Onsild nær Hobro, Jylland, Danmark
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Cirque de Campuls Ariège Pyrénées
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Kalø Slotsruin v dæmningen mod ruinen, Danmark
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Stjärneholms borgruin, Skurup, Skåne
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Stenarmen ved Mariager, Danmark
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Sagittaria rigida. The leaf in the center is from deep water; that at the right from shallow water near the shore.
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Potamogeton americanus. 1, seed; 2, seedling 5 days old; 3, seedling 14 days old; 4, seedling of four months; A, winter buds; 5, germinating winter bud, natural size; the last two winter buds belated in development. Aquarium specimen, January 24, 1914
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Potamogeton obtusifolius, erect axes bearing winter buds. October.
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Potamogeton Robbinsii, photo-micrograph of section through old stem, showing arrangement of mechanical tissue--Detail.