I 5 2 
Notes. 
Desmidiaceae, Zygnemaceae, Vaucheriaceae, Cladophoraceae, Oedo- 
goniaceae, and other green Algae ; and, singularly enough, these two 
same species of Closterium , C. lanceolatum and striolatum , have both 
been described as infested by a parasitic Chytridium . After a careful 
comparison with such descriptions and figures as are accessible to me, 
I am quite unable to identify these structures with the resting-condition 
of any known parasitic fungus ; while their very regular form, their 
thick coat of cellulose, and their bright green contents, suggest a 
totally different nature. 
The following are the principal memoirs consulted, though this is 
by no means a complete bibliography of the fungus-parasites of 
Algae : — 
Braun, A. : Ueber Chytridium (Monatsber. Berl. Akad., 1856). 
Reinsch : Beobachtungen iiber die Parasiten in Desmidienzellen (Pringsheim’s 
Jahrbiicher, Vol. XI. 1876). 
Sorokine : Ueber Olpidiopsis (Arch. Bot. Nord de France, 1S83). I know this 
only by quotation. 
Fisch: New Chytridiaceae (Sitzber. Phys.-med. Gesell. Erlangen, Vol. XVI, 
1884) ; und Beitrage zur Kenntniss der Chytridiaceen, 1884. 
Magnus : New Chytridiaceae (Verhandl. Bot. Vereins Prov. Brandenburg, 
Vol. XXV, 1884). 
Zopf : Ancylisteae et Chytridiaceae (Verhandl. k. Leop.-Car. Akad. Naturf. 
Vol. XLVII, 1885) ; Die Pilzthiere oder Schleimpilze, 1887 ; Untersuchungen 
iiber Parasiten aus der Gruppe der Monadinen, 1887. 
Dangeard : New Chytridium (Bull. Soc. Bot. France, Vol. VIII, 1886); Mem. 
sur les Chytridinees, 1888. 
Rosen : New Chytridium (Cohn’s Beitrage, Vol. IV, 1887). 
Lagerheim : Olpidiella (Morot’s Journ. de Bot., Vol. II, 1888); New Chytri- 
diaceae (Hedwigia, Vol. XXIX, 1890). 
De Wildeman: Parasitic Chytridiaceae (Ann. Soc. Beige Microscopie, Vol. 
XIV, 1890). 
De Bruyne : Monadines et Chytridiacees, parasites des Algues du Golfe de 
Naples (Archives de Biologie, Vol. X, 1890}. 
No. 4 ; NOR-SEXUAL PROPAGATION AND SEPTATION 
OP VAUCHEMA. — In examining some Vaucheria obtained from the 
Regent’s Canal, London, in October 1891, I observed a mode of 
production of non-sexual spores differing somewhat from anything 
that I find hitherto described, or that I have myself observed. As the 
alga was not in fructification, I cannot be quite certain about the 
species, but have little doubt about its being V. sessilis var. caespitosa. 
In several of the filaments the extremity was open, and the green 
