276 
S. Reginald Price. 
NOTES ON BATRACHOSPERMUM. 
By S. Reginald Price, M.A. 
[With Ten Figures in the Text]. 
ATERIAL of Batrachospermum moniliforme was collected for 
use in class in October, 1913, by Mr. Shrubbs. This was 
from a fresh locality at Sawston, Cambridgeshire, the streams at 
Fulbourne where it has been usually obtained having been drained 
by well-boring operations. This material was found to show 
considerable differences from that usually regarded as B. monili¬ 
forme, and a further examination of it was made. In February of 
the present year more material was gathered from the same spot, 
and it was found to have spread very considerably in the stream 
during the interval. This material was compared with the former 
samples and with others from different localities. It may be noted 
that B. atrum was also found in the same stream, in sparing 
quantities. 
The most striking feature of the October material was the 
presence of large numbers of peculiarly contorted and considerably 
hypertrophied trichogynes (Figs. 1-3). These were practically 
universal on the dark-coloured plants which were plentiful in the 
material, the other paler and more delicate plants having the typical 
B. moniliforme type of trichogyne (Fig. 4). Various examples of 
these trichogynes are figured, with a typical one of B. moniliforme 
on the same scale. 
Bent trichogynes have been found occasionally, and one 
slightly bent is figured by Sirodot 1 for B. testale, but Professor West 
tells me that he has never seen them all bent as in this material. 
The trichogynes seem to be functioning normally, for spermatia 
were attached in many cases, and carpogonia were frequently 
developing. No signs of any attacking fungus or animal which 
might have caused the hypertrophy were found. In the material 
collected in February, the general external appearance was very 
similar, and few trichogynes were present (carpogonia being very 
abundant); these trichogynes were generally of the normal type, 
although a few were slightly elongated. Variations in the general 
1 Sirodot, L. “ L,es Batrachospermes.” Paris, 1884, PI. 42, fig. 7. 
