268 
Fritsch . — The Sub aerial and Freshwater 
maximum (cf. West and West, ’02 A, PL IV, Figs. 39-41). Possibly the 
success of these few broad forms lies in this feature. It is, however, most 
requisite that the tropical habitats of the broad species of Oedogonium 
should be carefully studied. 
The genus Bidbochaete is not very well represented, but it is a form 
which may fairly easily escape notice. There is nothing, as far as I am 
aware, of particular interest attaching to its occurrence in tropical waters. 
5. The Freshwater Florideae of the Tropics. 
Since the Florideae, like the Cyanophyceae, are provided with a 
protective pigment (in the form of phycoerythrin and its modifications), we 
might expect this group to be a successful one in the tropics. It is, how- 
ever, an essentially marine group, and has but few freshwater representatives, 
all of which are not very common in our parts of the world. In the tropics, 
on the other hand, they seem to be not at all uncommon, as shown by the 
following enumeration of records : — 
1. Bairachospermum angolense , W. and G. S. West (West and West, ’97 a, p. 2 ; 
West and West, ’02 b, p. 125) ; B. Bohneri , Schmidle (Schmidle, ’ 99 , p. 2 ; Schmidle, 
’02 a, p. 67); B. bornense, Zanardini (Zanardini, ’ 72 , p. 146); B. gracillimum, W. 
and G. S. West (West and West, ’97 a, p. 2) ; B . huillense , Welw. MS. (West and 
West , ’97 a, p. 3) ; B. moniliforme , Roth (Gutwinski and Chmielewski, ’ 06 , p. 2 ; Mobius, 
’ 90 , p. 1070; Martens, ’ 70 , p. 299; Mobius, ’ 92 , p. 22; Zeller, ’ 73 , p. 192); B. 
moniliforme , vars. prolifer um and nodiflorum (Dickie, ’ 81 , p. 33); B. nigrescens, 
W. and G. S. West (West and West, ’97 a, p. 2); B. Puiggarianum , Grun. (Mobius, 
’ 92 , p. 22); B. Schwackeanum , Mobius (Mobius, ’ 92 , p. 18); B. vagum, A g. 
(Mobius, ’ 92 , p. 22) ; B. villosum , Zanardini (Zanardini, ’ 72 , p. 147). 
2. Chantransia chalybea , Fr. (Mobius, ’ 95 , p. 174); C. pulvinata , Schmidle 
(Schmidle, ’00 a, p. 188; Schmidle, ’00 b, p. 79); C. roseola , Zeller (Zeller, ’ 73 , 
p. 192) 
3. Compsopogon chalybeus , Kiitz. (Mobius, ’88, p. 222 ; Mobius, ’ 90 , p. 1070 ; 
Zeller, ’ 76 , p. 427); C.fuscatus , Zanardini (Zanardini, ’ 72 , p. 149); C. leptoclados 
Mont. (Dickie, ’ 81 , p. 123; Martens, ’ 71 , p. 144). 
4. Hildenbrandtia angolensis, Welw. MS (West and West, ’97 a, p. 3); H. 
rivularis (Liebm.), J. Ag. (West and West, ’97 a, p. 3; Hariot, ’ 91 , p. 1220). 
5. Thorea flagelliformis, Zanardini (Zanardini, ’ 72 , p. 148); T. Gaudichaudii , 
Ag. (Schmidle, ’00 d, p. 24); T. ramosissima , Bory (De Wildeman, ’00, p. 397); T. 
Traili ’, Dickie (Dickie, ’ 81 , p. 123). 
Lemanea does not appear to have been recorded from the tropics up to the 
present. 
As in our parts of the world, the freshwater Florideae of the tropics 
are found prevalently in running water, and appear to occur most commonly 
in mountainous regions. I have not been able to settle whether they are 
ever found in the actual lowlands of the tropics. 
