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Species: Potamogeton nodosus Poir. Date: 2006-09-24 Location: Small dam in forest off the Woodland Rd, Vumba Habitat: In the water; spikes emergent
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Subbæk Vandmølle ved Viborg, Danmark
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Soldaterskov ved Tønder, Danmark
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Harboslette, Hjardemål Klit, Thy, Danmark
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Stenarmen ved Mariager, Danmark
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Potamogeton americanus, spray showing attachment of cases of caddis fly (fam. Leptoceridae).
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Potamogeton obtusifolius, winter buds. October.
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Potamogeton Robbinsii, photo-micrograph of section through old stem, showing arrangement of mechanical tissue.
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Potamogeton heterophylius. 12, typical habit of land form; 13, terminal portion of rootstock showing tendency to become tuberous; 14, same, more advanced stage; 15, aquarium specimen
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Leafy pondweed (Potamogeton foliosus). Niagra Falls to Michigan and California (After Britton & Brown)
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Species: Potamogeton nodosus Poir. Date: 2006-09-24 Location: Small dam in forest off the Woodland Rd, Vumba Habitat: In the water; spikes emergent
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Subbæk Vandmølle ved Viborg, Danmark
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Soldaterskov ved Tønder, Danmark
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Harboslette, Hjardemål Klit, Thy, Danmark
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Stenarmen ved Mariager, Danmark
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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.
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Potamogeton heterophyllus (16-17); Potamogeton perfoliatus (18-19). 16, aquarium specimen; 17, aquarium specimen; 18, winter shoot showing elongation of internodes; 19, growing tips of same
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Potamogeton amplifolius, leaves, showing characteristic mines of Hydrellia.
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Species: Potamogeton nodosus Poir. Date: 2006-09-24 Location: Small dam in forest off the Woodland Rd, Vumba Habitat: In the water; spikes emergent
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Subbæk Vandmølle ved Viborg, Danmark
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Soldaterskov ved Tønder, Danmark
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Harboslette, Hjardemål Klit, Thy, Danmark
