The Botany of Iceland - 01.12.1942, Page 125
THE PTERIDOPHYTA AND SPERMATOPHYTA OF ICELAND
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41. Potamogeton praelongus Wulf. in Roem. & Schult. Arch. fiir
Botan. III (1805) p. 331.
Ingimar Óskarsson, 1929, p. 39.—Id., 1933, p. 40.—O. & Gr., 1934, p. 12.—
Steindórsson, 1935, p. 43.
Flora Dan. tab. 1687.
Icelandic: Langnykra. Danish: Langbladet Vandaks. English: Long Pond-weed.
This species was first found in the year 1925 by Ing. Óskarsson, in Neðra Selvatn
between Isafjörður and Mjóifjörður, N.W. Now it is recorded from several places
in N. also, and from one place in E. (Egilsstaðir at Lagarfljót). See fig. 37.
Life-form: HH (Hydrophyte).
In lakes and tarns.
Flor. VII. fr. mat. (?).
Max. length up to 285 cm.
Geogr. area: Am.: From Newfoundland to British Columbia and southward to Cali-
fornia, Montana, Iowa and New York.—Eur.: Fær. ; E.S.I. ; northern Scandinavia,
southward to France and Austria; Caucasus.—Asia: From the mouth of the Yenisei
to Kamchatka; Hokkaido.
42. Potamogeton pusillus Linn., Sp. pl. ed. I (1753) p. 127.
K. & M., 1770, p. 205.—Babington, 1871, p. 335.—Gronlund, Isl. Fl., 1881,
p. 105.-—Stefánsson, Fl. ísl., ed. 1, 1901, p. 18.—Ibid., ed. 2, 1924, p. 20.—
C.H.O., Fl. arct., 1902, p. 20,—O. & Gr., 1934, p. 12.
Flora Dan. tab. 1451.
Icelandic: Smánykra. Danish: Liden Vandaks. English: Slender Pond-weed.
In Iceland this species is very variable; the commonest are forms with prolonged,
Fig. 38. Potamogeton þusillus L.