199 
2. CLADOPHORACEAE. 
Pithophora, Wittr., 1877. 
*P. Kewensis, Wittr. Mon., 52. “In tank, water-lily house, Kew 
Gardens, August. "This singular plant is thought by Wittrock to 
have been an importation from oo It has not nói Seen in 
its original locality for two or three years.” (cp. Cooke, Brit. 
Freshw. Algae, 147.) I have not observed this dens during 
this summer. 
Cladophora, Kiitz., 1843. 
C. fracta, (Dillw.), Kütz. Sp. Alg., 410. Temperate house pools, 
“Bta 1901 ; laboratory tank, June, 1902 ; moat, July, 1902. 
Var. gossypina, Kitz. On the sides of a tank in house No. 8, 
September, 1902. The filaments were prese unbranched. 
This variety is new to the British Isles 
.C. erispata, (Roth.), Kiitz. Tab. Phyc., iv., t. 40, f. 1. Forming 
dull green floating masses in the lake, April, 1902 ; moat, July, 
1902; in a tank in the Herb. Dptmt., all the year round, 1902. 
C. glomerata, (Linn.), Kiitz: Tab. Phyc., iv. Frozen in the ice 
of the water- -lily pond, December, 1901. 
C. flavescens, Ag. Syst., 112. Water-lily pond, April, 1902. 
C. canalicularis, (Roth.), Kütz. Sp. Alg., 409. Side tanks of 
iteeHly house and tank in one of the pits, April, 1902; tem- 
perate house pools, May. 1902. 
Rhizoclonium, Kütz., 1843. 
R. hieroglyphicum, (4g), Kütz. Sp. Alg., 385, n. 12. Common 
rires the gardens; forming a darkish-green web on the sides 
a tank (above the tera of the Hie in one of the pits, February, 
; temperate house pools, July, 1902; streamlet in rockery, 
September, 1902 ; also abundant in the moat, April, 
Series 2. Ulothricheles. 
1. COLEOCHAETACEA E. 
Coleochaete, Bréb., 1844. 
C. scutata; Bréb. Ann. Sci. Nat., 1844, 29, t. 2. On leaves of 
Fontinalis in moat, May, 1902; on "water-plants i in the lake, June, 
1902. (ep. also Bennett, in Journ. Roy. Microscop. Soc., 1897, 
911.) 
2. CHAETOPHORACEA E. 
Aphanochaete, A. Brawn, 1851. 
A. repens, Braun Rejuv., 184. On Cladophora and Meso 
in lake, 1902 ; do: fi ae a flavescens, Ag., in — " PAE, 
A pril, 190 2; ae y, 1902; on iedipben erispata, tank, 
Herb. Dptmt., poets 1902. E 
