170 THE JOURNAL OF BOTANY 
the centre of the circle of arms, secretes a drop of water, which 
glistens and shines in the light. 
If the conidia springing from the upper surface of the rays of 
the conidiophore be transferred to a hanging drop of gelatine 
which Van Tieghem and Le Monnier described. The conidium at 
its formation is of an elongated fusiform shape with acutely pointed 
ends (fig. la). At the commencement of germination its middle 
is inflated zone that two slender 
yphe grow out in opposite directions (fig. 1b). From these 
hyphe the branched, septate mycelium rapidly develops, and at 
certain spots upon this mycelium the initials of the conidiophores 
soon make their appearance. Van Tieghem and Le Monnier state 
that the ends of the hyphe swell up to form fusiform bodies, which 
give origin to the conidiophores. In my cultures it appeared to 
me that intercalary cells of the hyphe, quite as often as terminal 
ones, swelled up sometimes into fusiform bodies, sometimes into 
more or less irregular shapes, and that these vesicles then grew 
up into sub-aerial prominences, from which the conidiophores 
developed. 
plasm (fig. 6). 
As the plant grows older the arms gradually bend back and 
expose the end of the pedicel and their own upper surfaces. More- 
over, in most cases, their apices now become forked and quite 
hyaline. It is worth noting that, whilst plants growing on their 
natural substratum usually had arms with a terminal bifurcation, 
those developed in hanging-drops more commonly maintained simple 
ends to their rays. 
In their earlier stages the rays are unseptate, but later two walls 
make their appearance in each. These walls are not equally dis- 
