26 i 
Algal Flora of the Tropics . 
In the following enumeration of tropical Spirogyras \ the species are 
arranged according to the number of chloroplasts in the cells in order to 
bring out the above point. The average width of the filaments in each 
species is added in brackets :■ — 
(i) Cells with a single spiral : — 
1. Sp. arcta (Ag.), Kiitz. (33-36/*) : — West and West, ’ 96 , p. 377. 
2. S. cateniformis (Hass.), Kiitz. (26-27-5 [*) : — Borge, ’ 03 , p. 280. 
3. S. condensaia (Vauch.), Kiitz. (48-62 /*) : — ? Mobius, ’ 90 , p. 1069. 
4. S. Goetzei , Schmidle (22-24 v) - — Schmidle, ’02 b, p. 251. 
5. S. gracilis , Kiitz. (17-5-19/*): — West and West, ’02 a, p. 162; Lager- 
heim, ' 93 , p. 162 (var. fi abyssinica , Lagerh., 10 /* diam.). 
6. S. inftata (Vauch.), Rabh. (18-19-5/*): — Borge, ’ 03 , p. 279. 
7. S. longata, Kiitz. (24-27/*): — Schmidle, ’00 a, p. 161 ; Schmidle, ’02 b, 
p. 251; ? Dickie, ’81, p. 125; Zeller, ’73, p. 185; Prain, ’05, p. 328 (f. elongala, 
Kiitz.) ; Lagerheim, ’90, p. 7 (f. elongata , Kiitz.) ; Lagerheim, ’90, p. 15 ; Mobius, ’89, 
p. 314 (f. elongala). 
8. S . quinina , Kiitz. (25-5-43/*): — Zeller, ’ 73 , p. 185; Borge, ’ 06 , p. 6 
(sub S. poriicalis (MiilL), Cleve). 
9. S. lenuissima (Hass.), Kiitz. (8 /*) : — Lagerheim, ’ 90 , p. 7 (var. plena , 
Lagerh.). 
(ii) Cells with two or three spirals : — 
1. S. adnaia , Kiitz. 2 (40-45 /*) : — Zeller, ’ 73 , p. 185. (2 spirals !) 
2. S. angolensis, Welw. MS. (49-63/*): — West and West, ’97 a, p. 41. (2, 
rarely 3 spirals !) 
3. S. decimina , Kiitz. (32-50/*) : — West and West, ’ 95 , p. 42 ; West and West, 
’02 a, p. 161 ; West and West, ’02 b, p. 133; Zeller, ’ 73 , p. 185; Zanardini, 
’ 72 , p. 152. (2, rarely 3 spirals !) 
4. S» dubia , Kiitz. (43-50 /*) : — West and West, ’ 96 , p. 378 ; Dickie, ’81, p. 125 
(var. longiarticulala). (2 or 3 spirals !) 
5. S. Grevilleana (Hass.), Kiitz. (20-33 /*) : — Borge, ’ 03 , p. 280. (1 or 2 
spirals !) 
6. £. irregularis , Nag. 2 (32-36 /*): — Zeller, ’ 73 , p. 185. (2 or 3 spirals!) 
7. S. quadraia (Hass.), Petit (27-33 /*) : — Schmidle, ’02 b, p. 251 ; Lagerheim, 
’ 90 , p. 15. (1 or 2 spirals!) 
8. S. rupestris, Schmidle (33 /*):— Schmidle, ’00 a, p. 170; Schmidle, ’00 b, 
p. 18. (2 or 3 spirals !) 
9. A. Schmidlii , W. and G. S. West (31-35 /*) : — West and West, ’02 a, p. 161. 
(2 or 3 spirals !) 
10. S. Welwitschii , W. and G. S. West (65-75 h) 1 — West and West, ’97 a, p. 41. 
(2, rarely 3 spirals !) 
(iii) Cells with three or often a larger number of spirals : — 
1. S. crassa, Kiitz. (120-150 /*) : — Zeller, ’ 73 , p. 185; Gutwinski, ’02 a, p.578 
(var. maxima (Hass.), Hansg.) ; Prain, ’ 05 , p. 329 (sub S. Heeriana , Nag.). 
1 Undetermined sterile species are not taken into account. 
2 A certain amount of doubt attaches to these determinations. 
