16 
NEW COSMARIUM IN TRAFALGAR SQUARE. 
We have been somewhat surprised to learn that Dr. Wittrock 
has found a new species of Cosmarium in the fountains of Trafalgar 
Square (London), which he calls Cosmarium trafalgaricum. New 
organisms turn up in the most unexpected manner, and, although 
this was found as far back as 1872, many of us are now hearing 
of the fact for the first time. Specimens are published in 
Wittrock’s Exsiccati, it is presumed, although not detected in the 
copy we have seen, under No. 81. It has been thus described : — 
Cosmarium trafalgaricum. Wittr. 
Parvum, quinta fere parte longius quam latus, in medio pro- 
funde constrictum, sinu lineari extrorsum ampliato, membrana 
glabra ; semicellulis a fronte visis reniformibus, latere dorsali in 
medio leviter emarginato, a latere visis orbicularibus, in utroque 
latere tuberculo minimo mediano ornatis, a vertice visis ellipticis, 
lateribus tuberculo minimo mediano ornatis. Long, cell 24-26 m., 
lat. 20-21 m., crass 13-14 m. lat. isthmi 6-7 m. 
In the fountains, Trafalgar Square, London. Allied to C. 
Phaseolus, Breb., and may be compared with C. Bicardia, Reinsch. 
Braithwaite’s British Moss Flora. — The attention of 
Bryologists is specially directed to the announcement, which 
accompanied the last number of “ Grevillea,” of the commencement 
of a series of monographs by Dr. R. Braithwaite, F.L.S., of the 
families of British mosses. These monographs will each be com- 
plete in itself, illustrated by plates of all the species, with micro- 
scopical details of their structure. The work commenced with the 
Andreagaceae, which is ready for delivery. Subscribers for the first 
section will receive twelve plates illustrating the Andreasaceae (2), 
Buxbaumiacea© (1), Georgiaceae (1), Polytrichacese (5), and 
Fissidentacese (3). The subscription for this, and similar sections, 
will be half-a-guinea. It is unnecessary to add that this work will 
be thoroughly abreast of the time, and that Dr. Braithwaite may 
be relied upon to do his duty completely and satisfactorily. 
The above paragraph was written for insertion in our last num- 
ber, but pressed out for lack of space. Since then we have seen 
the two parts already issued, and find them fully equal to our 
expectations. No Bryologist in this country, or indeed in the 
United States, can do without a copy of this Moss Flora, which, 
being privately printed, we would recommend them strongly to pro- 
cure without delay. It may be had direct, on application to the 
author, No. 303, Clapham Road, London. 
