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one point. It is generally strongly flattened and orbicular, with 
edges more or less strongly crenate. Within, the central filaments 
radiate from the attached portion, but the cortical filaments are 
convolute and twisted. It is the WV. cristarum of Bailey and the 
NV. alpinum ot Wood and Wolle. Bailey found it in New York, and 
Wood and Wolle in Pennsylvania. The writer has it from near 
Harrisburg, Penn., collected by Harry M. Kelley, and has found 
it in abundance in brooks at Mt. Carmel, Conn. 
Anabaena variabilis Kuetz., which may be distinguished from 
any other species of the genus occurring in this country by its 
oval, seriate spores remote from the heterocysts, occurred to the 
Writer in the autumn of 1894 in the brackish pond near Watch 
Hill, R. I., mentioned above. There was a great abundance of it, 
forming a dark greenish-brown, gelatinous layer on the floating 
leaves of Ruppia. The species is new to North America. 
Schizothrix lardacea (Ces.) Gomont. Of the twenty-seven 
Species of this homocysted genus given by Gomont in his mono- 
graph, only four are credited to North America north of Mexico. 
S. lardacea was found in some abundance on dripping vertical 
faces of trap at East Rock, New Haven, Conn. It formed masses 
of a dirty brown color. It has previously been found only in 
Germany, France and Italy. 
Sch. fr agilts (Kuetz.) Gomont was found at Brookfield, Conn., 
forming reddish crusts on stones kept moist by the spray from a 
Waterfall. The red color was due to a unicellular organism asso- 
ciated with it. Hitherto it has been credited only to Switzerland. 
flydrocoleum homoeotrichum Kuetz. The species of the genus 
ydrocoleum are distinguished by their caespitose habit and calyp- 
trate terminal cell. No one of the four fresh water species is cred- 
ited to North America. A. homocotrichum, however, was found 
by the writer growing in small short tufts on the posterior ends of 
shells of living fresh water mussels (Axodonta) in Trading Cove 
Brook, N orwich, Conn. 
Symploca muralis Kuetz., collected in New England by Farlow 
8Tows also on moist soil about the public pump in East Falmouth, 
Mass., and what appears to be the same species occurs abundantly 
On flower pots in greenhouses in New Haven, Conn. 
Lyngbya versicolor (Wartm.) Gomont, not credited to North 
