Bickett—The Larger Aquatic Plants of Green Lake, 387 
the small stream that enters the lake here, Castalia is abundant, 
and there is less Nymphaea. 
The marshes at the southwest corner of the lake have a rich and 
varied flora. Here one finds Bidens Beckii, various species of 
Typha, Sagittaria, and many others. Sagittaria latifolia is found 
mostly on land or at the water’s edge; S. heterophylla, with its 
long lance-shaped leaves easily mistaken for those of a Carex, 
grows half submerged in shallow water. There is a Carex growing 
in a similar situation, both here and in several other places; in its 
young stages it may be mistaken for Vallisneria. 
All the swampy or boggy parts of the shore are fronted by bars 
some distance out from shore. These bars have the usual shallow 
water flora and in addition large patches of Scirpus, of which sev¬ 
eral species were observed. 
The attached algae form a smaller percentage of the total yield 
of the lake than they do in Mendota, owing chiefly to the com¬ 
paratively small quantity of Cladophora. This plant, when present, 
is found on rocks at the water’s edge, or only a few inches be¬ 
neath the surface. In many places it is replaced by a thin fringe 
of Oedogonium. In some of the muddier stations (for example. 
Stations 32 and 33), there are quantities of Spirogyra, attached 
both to the mud and to rocks. The blue-greens, of which Nostoc 
and Rivularia were collected, are attached to the rocks near 
the shore and to the stems and leaves of many of the other plants, 
especially to the species of Potamogeton. Vaucheria tuberosa was 
found in one place (Station 37) in fairly deep water,—6.5 meters, 
averaging as high as 200 grams per square meter (wet weight) 
over a small area. It has been described as growing in a similar 
location in Lake George, N. Y., by Miss E. Moore (1). 
As already indicated, the plant belt extends down to 8 meters 
beneath the surface, much deeper than that of Mendota. This is 
probably due largely to the greater transparency of the water. At 
the water’s edge, there is, in all except the marshy places, a zone 
of rocks almost barren of plants. In Mendota, where a similar 
rocky beach exists, it is almost always densely covered with Clado¬ 
phora. In Green Lake there are occasional patches of Cladophora, 
frequently a thin strip of Oedogonium, and here and there isolated 
plants of Myriophyllum arising from between the rocks. Out¬ 
side of the border of rocks there is sometimes a thin strip of mud 
or sand bearing small, scattered plants, usually Char a, Naias, and 
Hetheranthera. Here the water is about 1 meter in depth and this 
