Simmons, Pemarks about the Relations of tbe Floras etc. 161 
and collectors, who Rave brought the knowledge abont tbis part 
of tbe arctic regions far beyond tbat we bave of most others. 
The scantiness of tbe list from tbe Siberian Polar Sea doubtless 
is cansed in a great measure by tbe nature of tbe coast, tbat 
is nnfavonrable for tbe growth of algae (cf. Kjellman, 30, p. 7, 
20 etc.), bnt tben tbis long coast is almost only explored during 
one sole voyage, tbe Vega-expedition. On tbe american side I 
tbinb only exploration is lacking; many parts of tbe coast of 
tbe continent as well as of tbe islands are favourable enough, 
bnt bere a great work is still left nndone. 
However, for tbe investigation bere contemplated, tbere is 
another point of view of still greater importance tban tbe num- 
bers of species in tbe different districts. Tbat is tbe distribu- 
tion of tbe species in those districts, which is summarized in tbe 
following table. 
Table III. 
Distribution of species 
Pkaeo- 
pbyceae 
Pkodo- 
pkyceae 
Total 
1. In all arctic districts 
9(10) 
8(9) 
17 (19) 
2. W. Greenl., Spitzb. prov., Asiatic Pol. Sea 
5 
2 
7 
3. — — — Am er. — — 
10 
5(6) 
15 (16) 
4. — Asiat. Pol. Sea — — — 
0 
0 
0 
5. Spitzb. prov. — — —■ — — — 
0 
3 
3 
6. W. Greenland, Spitzbergen prov. 
23 
19 
42 
7. — Amer. Polar Sea 
0 
1(2) 
1(2) 
8. — Asiat. — — 
0 
1 
1 
9. Spitzbergen prov. — — — 
0(1) 
3 
3(4) 
10. — — Amer. — — 
0 
0 
0 
11. Asiatic Polar Sea — — 
0(1) 
0 
0(1) 
12. W. Greenland 
19 
8 
27 
13. Spitzbergen province 
11 (12) 
17 
28 (29) 
14. Asiatic Polar Sea 
o 
2 
4 
15. American — — 
1 
3 
4 
84 
75 
159 
I bave bere also inclnded sncb combinations of distribntion, 
as, altbongb theoretically possible, are not fonnd in reality. It 
is however of some importance to observe as well tbe lacking 
of tbese as also tbe nnmber of species for eacb existing com- 
bination. 
Beihefte Bot, Centralbl. Bd. XIX. Abt, II. Heft 1. 
11 
