262 
Fritsch . — The Sub aerial and Freshwater 
2. S. cylindrospora, W. and G. S. West (70-77 n) : — West and West, ’97 a, p. 42. 
3. S. Fiillebornei, Schmidle (40-42 d): — Schmidle, ’03 a, p. 76. 
4. S. Holstii, Hieron. (55-65 d) : — Hieronymus, ’ 95 , p. 21. 
5. -S', insignis (Hass.), Kiitz. (39-42 n): — Mobius, ’ 89 , p. 314. 
6. S.jugalis, Kiitz. (72-98 /x) : — Zeller, '73, p. 185. 
7. -S'. lineaia , Suring. (50-65 /x) : — Henriques, '86, p. 218 (f. gracilior ). 
8. S. ?najuscula, Kiitz. (54-62 /x) : — Zeller, ' 73 , p. 185; De Wildeman, ' 97 , 
p. 84 (var. minor , Wittr. et Nordst.) ; De Wildeman, '00, p. 116 (var. minor , Witlr. 
et Nordst.). 
9. S. Malmeana, Hirn (76-91 n) : — Schmidle, '01 a, p. 46 (var. minor T) \ 
Borge, ' 03 , p. 281. 
10. S. maxima, Wittr. (104-117 /x) : — Borge, ' 99 , p. 10; Borge, ’ 03 , p. 281. 
11. S.neglecta, Kiitz. (53—65 /u.) : — West and West, '02 a, p. 161 ; West and 
West, '02 b, p. 133; West and West, ' 96 , p. 378 (var. ternata (Ripart)); West and 
West, '97 a, p. 41 (var. ternata) ; West and West, ' 99 , p. 281 (var. ternata). 
12. S.nitida (Dillw.), Link. (60-78 /x) : — ? Mobius, ' 93 , p. 123; Schmidle, ' 95 , 
p. 298; De Wildeman, '00, p. 114; ? Mobius, ' 90 , p. 1068; Prain, ' 05 , p. 328; 
Zeller, ' 73 , p. 185; Martens, '66, p. 21; Askenasy, '89 (sub S. princeps (Vauch.), 
Cleve). 
13. S. pallida, Dickie ? (30 /x): — Dickie, ’ 80 , p. 281 (see also Hieronymus, 
' 95 , p. 21). 
14. S. Paraguay ensis, Borge (41-45 /u) : — Borge, ' 03 , p. 280. 
15. S. Reinhardii, Chmiel. (108-117 d) : — Borge, ' 03 , p. 281. 
16. S.rivularis, Rabh. (36-40 ft): — Schmidle, '02 a , p. 65; ? Mobius, '88, 
p. 242. 
17. S. setiformis (Roth), Kiitz. (85-1 10 /x): — West and West, ' 96 , p. 377; 
? Mobius, ' 93 , p. 123; De Wildeman, '00, p. 115. 
18. S. tropica, Kiitz. (70-90 /x ?):—? Mobius, '88, p. 242; Dickie, ' 81 , p. 125; 
Martens, ' 70 , p. 298 ; ? Mobius, ' 92 , p. 24 ; Zeller, ’ 73 , p. 185 ; Zeller, ’ 76 , p. 427. 
19. S. variabilis, De Wild. (80-88 d ) : — De Wildeman, ' 97 , p. 83 ; De Wilde- 
man, '00, p. i 1 5. 
Although this list shows to some extent the preponderance of broad 
forms with several chloroplasts to the cells, it is of course merely an 
enumeration of species and records, and, as I have had frequent occasion 
to point out already, it gives us no idea of the relative abundance of 
individuals. Still, it gives some support to the view that, as observed in 
Ceylon, the tropics may in general have a relatively larger number of broad 
Spirogyras than our parts of the world. It is certainly striking in how 
many of the tropical floras we find almost only broad forms mentioned 
(cf., for instance, De Wildeman, ’ 00 , West and West, ’97 A and ’02 b). 
It may be that further observation may show that the above inference is not 
correct, but the matter is certainly worthy of attention. 
There is little that is especially noticeable regarding the distribution 
of Spirogyra in the tropics, and it is probable that most of the species will 
