1899] Collins, — Notes on Algae 9 
cies. I find it as high as 1,500 ft. in the Green Mountains ; the others 
never above 500 ft. In the mountains it grows in boggy thickets; but 
at lower levels in dry or moist, but not wet, woodlands. 
The other species are far more exacting in their requirements as to 
soil, moisture and shade. .S. gregaria grows in quite moist, heavy soil, 
rich with leaf-mould, where one would look for Phegopteris hexagonop- 
tera or Asplenium angustifoltum. It affects the banks of small brooks 
in flat woodlands. S. trifoliata also requires moisture, and is often 
found growing with .S. gregaría ; but it also occurs on banks of gravel 
or till, along the base of the mountains. .S. Canadensis is found along 
shaded ledges in a drier situation than that required by the other 
species; but in two localities I have seen it growing with S. trifoliata. 
The fruiting characters of the four species are fully and admirably 
described by Mr. Bicknell in the article above cited. 
MIDDLEBURY COLLEGE. 
NOTES ON ALGAE.— I. 
F. S. COLLINS. 
In this series of articles the writer hopes to publish, from time to 
time, such additions to the New England Algae as may come to his 
notice, as well as items of interest in regard to species already known 
to exist here. ‘The present paper adds two species new to America ; 
the type of one species hitherto represented only by a variety ; and one 
species believed to be undescribed. 
The first addition to the American flora, CyZndrospermum catena- 
tum Ralís, is distinguished from other species of the genus by having 
the spores in series, sometimes as many as fifteen adjoining ; while all 
others have the spores scattered singly through the filament. Itoccurred 
on moist ground in Middlesex Fells, Mass., by the shores oi Spot Pond, 
in August and September, 1898, the spores reaching maturity the last 
of September. It formed a dark, thin coating on the ground, looking 
as if a little black paint had been spilled and dried. 
The past summer was a very favorable one in this vicinity for algae 
of this kind; the weather was extremely hot in July and August all 
over the country ; but while there was almost a drought in many sec- 
tions, as in New York State and in Maine, on opposite sides of this 
region, in the vicinity of Boston there were frequent rains, so that even 
