The Botany of Iceland - 01.12.1912, Page 70

56
H.JÓNSSON
Table 2. The Distribution of the 76 species not common to all
the coastal districts (continued).
A O a O Z. NW.Icel. O o 'i C/3 C/3 ■s £ 123 N. Icel. NW.Icel. iSW. Icel. S. Iccl. B
-4-- + + + 43. Ceramium arborescens
(+)(+) + + 44. Ahnfeltia plicata
19. Polysiplionia arctica .... + + + + + + + + 45. Cystoclonium purpura-
scens
20. Ptilota pectinata -X- + + + + + + + 46. Ptilota plumosa
+ + + + 47. Petrocelis Hennedyi
21. Peyssonellia Rosenvingii. + + + + + + + + 48. Corallina officinalis
+ + + 49. Lithophyllum Crouani
22. Coilodesme buliigera .... + + + + + 50. Polvsiphonia nigrescens
+ + ðl.Myrionema vulgare
+ + + 52. Leathesia diíformis
(+) + + 53. Delesseria sanguinea
Total. . . 15 13 8 5 . . 1 10 13 40 40 Total
To illustrate more distinctly how the species with a north-
eastern distribution (A) and those with a south-western distribution
(B) intermingle in N., NW. and SW. Iceland I subjoin tlie following
figures taken from the prec.eding table: —
E. Icel. N. Icel. NW. Icel. SW. Icel. S. lcel.
(1) 10 13 40 40 B
A 15 9 + 4 8 5
Notes on the species. Of the 4 species (A, 1—4, Tab. 2)
which have been found only in E. Iceland, Nos. 1 and 3 oceurred
in great abundance in several of the fjords, while Omphalophyllum
was found only in Reyðarfjörður, where it occurred abundantly,
and Acrosiphonia in one place only. Delesseria Baerii, I suppose
(31, p. 140), has originated from either E. or N. Iceland.
Turnerella is most common in E. Iceland, and in addition to
the habitat in N. Iceland which has been published (31, p. 135) has
been found by B. Sæmundsson in Steingrímsfjörður in the most
western part of the north coast; consequently it must have a wide
distribution along this coast. With regard to Lithothamnion foecun-
dum and Laminaria fœroensis it must be assumed that they are
more frequent in E. and N. Iceland than is known at present, and
as the latter species occurs in the Færöes, it may well be expected
to be met with on other parts of the coast of Iceland.