IO Rhodora [JANUARY 
in the last of August the foliage had hardly lost its spring freshness, and 
the brooks flowed as freely as in April or May. The algae that usually 
show themselves as the water in the ponds becomes low had no chance 
to make an appearance; while those that grow on damp ground were 
more abundant than in any previous season that the writer can remem- 
ber. Schizothrix Friesii (Ag.) Gomont was specially abundant in paths 
and by roadsides in Middlesex Fells and Lynn Woods; like some of 
the higher plants, it seems to prefer roads and paths to woods and 
fields. Other species of Vostochaceae, though not so conspicuous as 
the Schizothrix, were much more noticeable than usual. 
A second species of Schizothrix, S. purpurascens var. cruenta (Les- 
pinasse) Gomont was found on the ground near Winchester Reservoir 
in Middlesex Fells, Mass., in August and September. It grew in com- 
pany with Stigonema species, etc., and has not before been reported in 
N. America. "There is, however, a specimen in Herb. Farlow, collected 
by Ravenel in South Carolina. It is characterized chiefly by the 
ample, red or rose-colored sheaths, trichomes 6-8 y diam., and by 
the prostrate habit. 
In August, 1896, the writer described in Erythea, Vol. IV, p. 119, 
and in September of the same year distributed in Collins, Holden and 
Setchell, Phycotheca Boreali-Americana, No. 207 ; Anabaena catenula 
var. Americana Collins. It grew in a ditch in Middlesex Fells, among 
other species of minute algae ; and differed from the European type in 
having longer spores, up to 60 p, the spores being exactly cylindri- 
cal. In the same summer, the writer found what appears to be the 
typical A. catenula (Kuetz.) Born. & Flah., with spores not over 30 p 
long, and slightly constricted at the middle. Itoccurred at Eagle Island, 
Penobscot Bay, Maine ; growing in a ditch near the beach, above high 
water mark, but probably within reach of the spray in storms. The 
algae growing with it were, however, all strictly fresh water species. 
In July, 1890, the writer found a small Rivularia growing on sub- 
merged stones on the borders of Spot Pond, in what is now the 
Middlesex Fells Reservation. It was placed in his herbarium under 
R. minutula (Kuetz.) Born. & Flah., but with a mark of doubt. Since 
then, a specimen has been submitted to Dr. Bornet, who has pronounced 
it distinct from the species named, and probably from any described 
species. The writer would characterize it as follows : — 
Rivularia compacta, n.sp. Fronds globose or subglobose, firm, 
not encrusted with lime, dark green or blackish, smooth, minute, sel- 
