The Botany of Iceland - 01.12.1912, Page 62

III. THE HORIZONTAL DISTRIBUTION OF THE
SPECIES AND THE COMPONENTS OF THE
ALGAL FLORA.
IN the following list (Table I) of the hitherto known Marine Algæ
of Iceland a letter (A, B1? B3, C, D, E1? E3) is placed before
each species, showing to which plant-geographical group I refer it
(cf. Börgesen and Jónsson, 14). A indicates the arctic group,
Bx sub-division 1 of the subarctic group, B2 sub-division 2 of the
subarctic group, C the boreal-arctic group, D the cold-boreal group
and E the warm-boreal group. The letter c placed after the name
of the species indicates that it has been found in all the five
coastal districts (E. Icel., N. Icel., NW. Icel., SW. Icel. and S. Icel.,
see above, p. 5); a (c) placed after the name of the species indi-
cates that it probably occurs in all parts of the coast.
Table 1. The Distribution of the Species aiong the coast.
E. Icel. N. Icel. NW.Icel. SW.Icel. S. Icel.
Rhodophyceæ.
c Bangia fusco-purpurea (c) + + + +
c Porphyra umbilicalis c + + + + +
B2 P. miniata c + + + + +
D Porphyropsis coccinea + +
b2 Conchocelis rosea c + + + + +
c Chantransia microscopica (c) +
D C. Alariæ + +
C C. secundata c + + + + +
b2 C. virgatula (c) + +
E, Chondrus crispus (+) + +
D Gigartina mamillosa (c) + + + +
C Ahnfeltia plicata (+) (+) + +
b2 Phyllophora Brodiæi * interrupta .... -U J +
D P. membranifolia .. . . + +
b2 Actinococcus subcutaneus + +
A Ceratocolax Hartzii +
D Cystoclonium purpurascens + + + +