240 
Fritsch . — The Sub aerial and Freshwater 
6. Protococcus caldariorum , Magn. — Schmidle, ’00 d, p. 8 (on leaves of trees, 
&c. ; probably a stage in development of various Cbroolepideae). 
7. Protococcus cinnamomeus , Kiitz. — Schmidle, ’00 a, p. 161 (no locality given). 
8. Protococcus cohaerens , Kiitz. — Prain, ’ 05 , p. 329 (damp walls). 
9. Protococcus viridis, Ag. — Schmidle, ’00 a, p. 161 (no locality given) ; West 
and West, ’97 a, p. 239 (‘ Loanda. Ad parietes domorum, &c., saepius humectatas in 
ipsa urbe Loanda, ast sparsim. Locus habitationis huius algae austrum versus 
spectat ’) ; Dickie, ’ 81 , p. 125 (‘ Damp wood at Tabatinga, and at Serpa ’) ; Schmidle, 
’97 e, p. 258 (‘Auf faulendem Holz, dunkelgriin, Matautu, Savaii ’) ; Lagerheim, 
’ 90 , p. 4 (on trunks of Prunus salicifolia , H. B. K.). 
10. Stichococcus bacillaris , Nageli. — Lagerheim, ’ 90 , p. 5 (‘ En los muros humedos 
en el jardfn botanico y en otros lugares en Quito ’). 
1 1. Stichococcus flaccidus (Kiitz.), Gay. — West and West, ’97 a, p. 239 (‘ Loanda. 
Inter Proiococcu? 7 i botryoidem (Kiitz.), Kirchn.’). 
12. Urococcus insignis (Hass.), Kiitz. — West and West, ’97 a, p. 239 (‘ Huilla. 
In paludibus exsiccandis ’) ; West and West, ’ 93 , p. 268 (on mossy trees, summit 
of Trois Pitons (4,500 ft.), Dominica). 
13. Cerasterias siaurastroides , W. and G. S. West. — West and West, ’ 93 , p. 268 
(with Scytonema javanicum , Bornet, amongst mosses on lime-trees, Shanford Estate, 
Dominica). 
14. Gloeocysiis gigas (Kiitz.), Lagerh. — West and West, ’ 99 , p. 285 (‘ On trees 
in woods round Roseau Lake, Dominica ; with Oocystis solitaria, Wittr.). 
15. Gloeocysiis rupestris (Lyngb.), Rabh. — West and West, ’97 a, p. 239 (‘Pungo 
Andongo. Alga terrestris, ad ligna putrescentia in rupibus convallibus ’). 
16. Hormidium mur ale, Katz. — Schmidle, ’00 a, p. 160 (no locality given). 
See also Rhizoclonium crassipellitum , W. and G. S. West (p. 250), and R. spon- 
giosum , Dickie (p. 251). Regarding Trentepohlia , see below, p. 242; terrestrial 
species of Vaucheria , p. 254. 
This list shows that the records of green forms in the subaerial vegeta- 
tion are meagre, especially when compared with the often very numerous 
records of subaerial blue-green forms (cf. table, p. 244). Moreover, such 
data as to habitat as are given point, at least in some cases, to some sort 
of protection against illumination ; I have indicated such points by placing 
the words in black type, and do not think it necessary to offer further 
comment upon them at present. 
The dominance of the Cyanophyceae in the subaerial algal vegetation 
of the tropics is thus manifest, and I cannot doubt that in other damp 
tropical parts they will be equally and perhaps even more strikingly 
developed than they are in Ceylon. A visit to any moist and hot green- 
house shows exactly the same thing, viz. great development of subaerial 
algal growth, which is almost purely blue-green. Everything points to 
most of the subaerial Cyanophyceae being more at home in a moist, hot 
atmosphere than in a cold one. Subsequent considerations will show that 
