The Botany of Iceland - 01.12.1914, Blaðsíða 111

PHYSICAL GEOGRAPHY
295
cryptogams may, I think, be estimated at 400—450. Chr. Grön-
lund in 1884 enumerated 866 species (340 + 26); E. Rostrup in
1887, 409 species (381 + 28); E. Warming in 1888, 417 (388 + 29);
St. Stefánsson in 1890, 423 species (395 + 28), but in “Islands
Flora,” 1901, only 359 species; Helgi Jónsson recorded in 1896,
435 species, but in 1904, 360 species. It is thus seen that the number
of the species differs somewhat according to the different authors;
the reasou for this I shall not enter into more closely here. For
comparison it may be mentioned that the number of species known
from the Færöes (Ostenfeld, Botany of the Færöes) is about 300
species of phanerogams and vascular cryptogams, from Greenland
(E. Warming, 1888) 386 species, from Denmark about 1450 species,
from Norway 1500. In the following I give an account for com-
parison and orientation; it is based on E. Warming’s statistics
(1888) and gives an excellent general idea of the subject, but it will
probablj7 be somewhat modiíied in its details on a later revision of
the material. Warming records, according to what Avas known at
that time of the flora of the island, that of circumpolar species
there were found in Iceland 64, in Greenland 96 and in the Færöes
36; of sub-boreal and sub-alpine species in Iceland 70, in Greenland
87 and in the Færöes 33; and of temperate zonal species in Iceland
151, in Greenland 82 and in the Færöes 134. Of species which
occur both in Europe and in America 48 are found in Iceland, 16
in Greenland, 47 in the Færöes; of those coinmon to America, Europe
and Spitzbergen 3 are found in Iceland, 5 in Greenland, 2 in the
Færöes; in common with America alone Iceland has two species
only, Greenland 21 and the Færöes none; in common Avith Europe
there occur in Iceland 42, in Greenland 19 and in the Færöes 54
species. Greenland has 222 species in common with Iceland, but
137 with the Færöes; on the other hand, Iceland and tl.e Færöes
Akad. Förhandlingar, Stockholm, 1884, pp. 79—124). E. Rostrup: Bidrag til Islands
Flora. (Bot. Tidsskrift. XVI, 1888, pp. 168—186). Stefán Stefánsson: Fra Islands
Væxtrige, I —III. (Vidensk. Meddelelser fra Naturh. Foren. i Köbenhavn, 1890, pp.
166-181; 1894, pp. 174—212; 1896. pp. 118—153). O. Gelert og C. Ostenfeld:
Nogle Bidrag til Islands Flora. (Botan. Tidsskrift, XXI, 1898, pp. 339—348). Helgi
Jónsson: Bidrag til Ost-Islands Flora. (Bot. Tidsskr., XX, 1896, pp. 327—357).
Helgi Jónsson: Floraen paa Snæfellsnes og Omegn. (Bot. Tidsskr., XXII, 1899,
pp. 169—207). Helgi Jónsson: Liste over Karkryptogamer og Fanerogamer i Syd-
Island. (Bot. Tidsskr., XXVII, 1905. pp. 62—82). As regards older botanical litera-
ture, see Bibliogr. in E. Warmiug: Den danske botaniske Literatur fra de ældste
Tider til 1880 (Botanisk Tidsskrift, XII, pp. 42 — 131, 158—247) and in Th. Thorodd-
sen: “Landfrædissaga Islands,” Vol. 4, Copenhagen, 1904.