Notes on Batrachospermum. 279 
carpogonium (glomerule) at the top (see Fig. 10) and cf. Sirodot ( l.c ., 
PI. V, Fig. 2). In this direction also variations of this type are 
found, leading to the ordinary small-celled axis. 
The B. atrum found was absolutely distinct in characters from 
these. 
It thus appears probable that a series of growth forms of B. 
moniliforme have been examined, and that under certain conditions 
B. moniliforme is an extremely variable species, as of course is well 
known, hut that these forms are probably not definite enough to 
merit the name of species or even of true varieties. 
The presence of a type somewhat like B. Corbula indicates, as 
Professor West suggested, that probably many of Sirodot’s species 
are really growth forms of a few common species. 
No explanation of the hypertrophied trichogynes is at present 
forthcoming, but it is hoped that the locality may be watched to 
see if they reappear from time to time. 
I desire to express my thanks to Professor West for his kind¬ 
ness in examining some of the material and looking through the 
manuscript. 
The Botany School, 
Cambridge. 
April, 1914. 
