278 
S. Reginald Price. 
A few of these types are figured (Figs. 5-7) from drawings 
made with a simple lens on approximately the same scale; further 
description of these types is unnecessary. 
Other features of interest were made out in the structure of 
the axis and form of the thallus, and here there seemed to be 
considerable variation in the material. 
The most striking variation was in the dark olive-black material 
collected in October. In this the axial cells were generally much 
larger than in the paler material (typical B. moniliforme), inflated 
at one end and practically without cortex. Professor West kindly 
sent me some material which he regarded as type B. moniliforme , 
and this was practically identical in characters with the “ B . moni¬ 
liforme ” of my material. I can find no descriptions of such a 
central axial row of cells in Sirodot, who studied these variations 
very closely, or in De Toni’s “ Sylloge Algarum.” Fig. 8 shows a 
few axial cells of such a form, and Fig. 9 the slight growth of 
cortical filaments at the bases of the verticels. These cells, even on 
the fairly old axes, were quite short. The following measurements 
give the general proportions. 
Wide Axial Cells . 
80-1 10/a or more wide. 
180-300/a ,, long. 
Typical moniliforme Prof. West.) 
Rather small. ' 
20-30/a 
„ wide. 
Ordinary Material (February)... 
60-90/a 
500-600/a 
„ wide. 
„ long. 
In general the central row seems to be practically cylindrical 
and comparatively slender when compared with this material. 
In February, other types of material were found. These 
differed considerably in external form, and one type seems to 
approach Sirodot’s B. Corbnla. These growth forms are probably 
not distinct, however, and they seem to merge into one another. 1 
The axis here is often inflated considerably at one end, but the 
cells are much elongated, and the cortex only partially covers the 
cells even at this stage. It would appear somewhat as if these axes 
represent axes corresponding to the Autumn material, of which the 
cells have increased considerably in length. There seems, however, 
to be practically every stage of axis form leading from this to that 
associated with typical B. moniliforme. 
In the material like B. Corbnla , Sirdt. also lateral axes of the 
verticels with very much enlarged cells occurred, each bearing a 
1 cf. De Toni, Vol. IV. Sect. 1, p. 50. 
