209 
Synechococcus,. Näg., 1849. 
S. aeruginosus, Nag. Hinz. Alg., 56, t. 1, E., f. 1. 
Var. cylindricus, nov. var. Cells 4—5 » diameter, 2-6 times 
as long, often slightly bent, cylindrical, with rounded ends, 
almost pure green in c olour ; forming a dark vro, highly 
gelatinous mass on the walls of the tropical fern house, 
August, 1902. 
Gloeothece, Näg., 1849. 
G. carrier ska Lagerh. in — ait cer ie 
Vetensk.-Akad. handl., 1883, No. 2, 37-7 k ming a 
rather thick di FM fer layer on the top of a yr» an in the 
Nepenthes house, March, 1902. New for British Isles. 
G. linearis, Wiig. Hinz. Alg., 58, G. f. 2. On walls in the 
pits belonging to the Orchid add September, 1902; forms a 
dirty green to purplish, highly gelatinous stratum 
? Gloeothece fuscolutea, Ng. Hinz. Alg.,58. On the end wall of 
Nepenthes house, forming little cyst-like masses, March, 1902. 
Aphanothece, Näg., 1849. 
A. prasine, Braun in Rabh. Alg., No. 1752. About the size of 
a pea the sides of a tank in one of the pits attached to the 
Orchid i. Nintembor, 1902, 
A pallida (Ktz.), Rabenh. Krypt. Fl. 3 gest 16. On stones 
in Victoria regia house, September, 1902 ; n pits iita to 
the Orchid houses, September, 1902. I e Have this not to have 
-2. NOSTOCHINEAE. 
Nostoc, Vauch., 1803. 
*N. carneum, Ag. Syst. Alg., 22. On walls of forcing house 
(Massee !). 
N. spongiaeforme, Ag. Syst. Alg., 22. On stones in tropical fern 
house, June, 1902; on stones in Victoria regia house, September, 
902. 
N. muscorum, Ag. Disp. oa 55. Between moe on the oe of 
a pit, November, 1901. Of the same green colour as the moss and 
consequently not very Be ident vm it; ; slightly CERIANO. 
N. humifusum, Carm. Eng. Fl., ii., 399. Forming small roundish 
lumps kr lin. in diameter oa ‘the wall of a pit, November, 
1901 ; s of Aroid house (No. 1)., September, 1902; walls of 
pit Upload to tropical moat house, September, 1902. 
*N. commune, Yauch. Conf., 222, t. 16, f. 1 fide. Wright! Ihave 
not Sbaerved this in the Gardens, although it is T 
pre 
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