201 
Microthamnion, Nàg., An 
M. kützingianum, Nag. in Ktz. Spec. "m g. 392. Growing ona 
Species of Cladophora in boni in one of the pits, March, 1909 ; 
Cladophora in tank in No. 8, September, 1902. 
4. ULOTHRICHACEA EE. 
Ulothrix, Kitz., 1845. 
U. moniliformis, Kütz. Tab. Phyc., ii., t. 88. In a glass vessel in 
the Herb. Dptmt., containing a water-moss from the River Severn ; 
intermingled with Oedogonium, Mesocarpus, &c., March, 1902. 
U. zonata, Kitz. loc., cit. ii, t. 90, f. 2. Attached to old tree 
stumps in pond, Mare h, 1902. The filaments were partly engaged 
in active zoospore-formation, and such filaments were coiled 
, AN 
Alge, Ulothrix zonata, Pringsh. Jahrb. x. 1876, 6.) It is 
probable that several = the other species mentioned are only 
forms of U. zonata, Kü 
U. bicolor, Ralfs d da No. 13. On old leaves in middle 
tank of water-lily house, April, 1902; on leaves in Victoria regia 
tank, June, 1902. 
U. variabilis, Avitz. loc. cit., ii., t. 85, f. 3. Vis the outer walls of 
the palm house, forming a greenish- black scum, January, 1902; 
Queen’s Cottage "Grounds, January, 1902; on rocks, subject to the 
drip of water, in the temperate house pools, March-September, 
1902. This species is nearly always to be found accompanied by 
Protococcus viridis or Chlorococcum humicolum. 
U. tenerrima, Kiitz. loc. cit., ii, t. 87, f. 1. On ledges in palm 
house, intermingled with other Algae, March, 1902 ; tank in Herb. 
Dptmt., June, 1902. 
U. radicans, Kvitz. loc. cit., ii., t. 95, f. 3. Laboratory tank, May, 
1902. 
U. coded (Vauch), Kütz. loc. cit., ii., t. 97, f. 1. On tree 
Ma in pond, January, 1902; on walls ‘ot Aroid house (No. 1), 
March, 1902. Usually found together with members of Proto- 
sexes 
5. MICROSPORACEAE. | 
Microspora, Thur., 1851. 
*M. floccosa (Ag.), Thur. Rech., t. 17, f. 4-7. Laboratory tank 
(Massee !). 
6. ULVACEAE. 
Enteromorpha, Link, 1820. 
E. intest meen Linn ), Link Ho Ber. (1820). Common in the 
lake, where it s to appear during the month of June, and 
During the winter months the dead tubes are washed up in great 
pus on the Boro: in a more or less decayed condition. Also 
common in the moat. I have observed the same species in great 
andnod i ina backwater of the Thames near Sunbury. 
