207 
Pleurococcus, Meneg., 1842. 
P. vulgaris, Meneg. Nost., 38,1. 5, f. 1. Common on tree-trunks, 
walls, &c., thoughout the gardens ; ; on the tree-stumps in the pond, 
on the stone-work of Temple of Aeolus, on trunks of palms in 
temperate ge 
P. angulosus (Corda), Meneg. Nost., t. 4, f. 5. On the trunk of 
js a very damp tree, March, 1902; on stone sides of pond, March, 
1902. 
Porphyridium, Nàg., 1849. 
P. cruentum, Nag. Hinz. Alg., 71, t. iv., H. On the outside walls 
e, 1902. emp 
AC cording to Wolle (Freshwater Algue of the United State eg, 
1887, 82), this is the same as Plewrococcus miniatus (Ktz.), Nag 
VI. CYANOPHYCEAE. 
1. CHROOCOCCACEAE. 
Chroococeus, Niig., 1849. 
C. cohaerens ( Bréb.) ser Hinz. Alg., 46. On damp walls and 
flower-pots, not rare; 1902. Also found in Botanice Gardens, 
Regent’s Park (cp. Bennett, loc. cit.). 
Gloeocapsa, Kiitz., 1843. 
G. livida (Carm.), Kütz. Tab. Pha Yc., i. t. 21, f. 5. Forming a 
blackish coating on the sides of a tank in one of the pits, February, 
n : on the rocks above the water, temperate house pools, 
March, 1902; on woodwork in No. 8, and on walls in No. 13, 
ceci e 1902. 
G. caldariorum, Rabh. Alg. Eur., ii, 37. On brickwork in pit 
No. 13a, January, 1902 ; Nepenthes house, March, 1902. 
G. po eieren n Tab. Phyc., i., t. 20. serunt forming 
a hina rs Ve the rocks, March, 1902; very common on 
the walls, de. otkan (Victoria regia iri dh Nepenthes 
house, mee rie house, &c.), 1902. 
G. quaternata, Kfz. Tab. Phyc., i., t. 20, f. 1. On the stone 
sides of a tank and on woodwork in No. 14, March-September, 
1902; on walls of tropical fern house (No. 2) together with G. 
mur alis, Kütz., August, 1902. 
G. aeruginosa (Carm.), Kiitz. loc. cit., pice la J-2. Forming a 
glaucous-green incrustation on the end wall of the serene 
house, March, 1902; walls of palm house and rocky walls 
Aroid house (No. 1), March, 1902. 
G. muralis, Kiz. Tab. Phyc., i, t. 21, f. 1. On woodwork in 
No. TR Dejwdiber. 1902. New for is British Isles 
