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Hornword (Ceratophyllum demersum). Found in ponds and slow streams throughout North America, except extreme north. (After Britton & Brown)
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Potamogeton crispus. 20, recumbent branch; 21, spicular bur; 22, denticulate bur; 23, sprouting bur; 24, denticulate bur; 25, spicular bur
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Ciceronia Pusilla. Adult Breeding Plumage; Lleast Auk
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Chara hydropitys.
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Dasya plumosa,, magnified.
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Rhodophycees ou Floridees (Algues rouges) Spgherococcacees, Calliblepharis ciliata (Huds.) Ktz..
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Rhodophycees ou Floridees (Algues rouges) Delesseriees, Delesseria sanguinea (L.) Lamour..
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Rhodophycees ou Floridees (Algues rouges) Rhodymeniees, Lomentaria articulata (Huds) Lyngb..
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Potamogeton filiformis (36-37); Potamogeton peclinatus (38-40). 36, habit sketch; 37, detail of tuberous rootstock; 38, young plant developing from tuber; 39, series of tubers; 40, tubers, showing details of early growth
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Potamogeton crispus, photo micrograph of section through stem of starch-filled vegetative structure; a, cell with starch grains. November.
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Rhodophycees ou Floridees (Algues rouges) Porphyrees ou Bangiales, Porphyra linearis (Grev.) De Toni.
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Field of Phyllospadix scouleri.
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Fitzroya eigenmanni Haseman. Type.
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Rhodophycees ou Floridees (Algues rouges) Rhodymeniees, Chylocladia clavellosa (Turn.) Grev..
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Cynara Cardunculus, or Cardoon.
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Chrysymenia enteromorpha, from Bogue Beach.
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Cedar growing over fallen log of same species.
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Potamogeton crispus, burs in various stages of development. June.
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Lysichiton camtschatcense with background of Polystichum and Lomaria.
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Lomentaria rosea.
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Rhodophycees ou Floridees (Algues rouges) Ceramiees, Halurus equisetifolius (Lightf.) Ktz..
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Potamogeton amplifolius, leaves, showing characteristic mines of Hydrellia.