74 
thick cells give rise to from 1 to 0 or more conidiophores. I have figured 
the tubercular mass and several of the component groups of cells with 
their single hyplwe and varying number of conidiophores. (Plate xin, 
Figs. 1-7.) The compound tubercular masses vary greatly in size, usu¬ 
ally 3 to 15 in diameter. The number of conidiophores arising from 
them commonly varies from 20 to 50, but I have seen two well-developed 
conidiophores issuing alone from a stoma and having a well-defined tu¬ 
bercular base, with at least two distinct mycelial liyplue springing from 
it. It is also common to find a greater number than 50 conidiophores 
in one fascicle. 
The fascicle of conidiophores pushes through the epidermis, or, in 
some cases, through a stoma. The cuticle is raised, pierced, and broken 
by the pressure, and the conidiophores arise to a height of 14-13 jx or 
more. The walls of these conidiophores are rather thick, but not as 
dark in color as they afterwards become. The conidiophore may be 
simple with the basal part somewhat swollen, or it may be more or less 
twisted and curved. It is common to find the distal end sharply bent 
to one side and then turned upward, giving a shouldered form. Where 
this is repeated it forms a dentate end. I have seen at least five such 
irregularities in one conidiophore. From the tip of this straight, curved, 
shouldered, or toothed conidiophore arises the conidium already de¬ 
scribed. For stages in the growth of the conidium see Plate xi, Figs. 
9-17. In some cases two conidia have been seen attached to the 
conidiophore at the same time. One arose from the curved tip, and 
the other from the shoulder of the conidiophore. From the number of 
curves made by the conidiophore it appears probable that several suc¬ 
cessive conidia are sometimes produced upon them. In transverse 
diameter the conidiophore varies between 3 jx and 5 yu, but when should¬ 
ered the tip is much reduced. The fascicles may be at first made up 
of slightly curving and mostly tapering conidiophores. They may pre¬ 
sent a mingling of the curved, shouldered, and toothed conditions, or 
else, especially when old, wholly composed of the shouldered and toothed 
forms. The matured conidiophore is capable of sending from its ex¬ 
tremity a secondary growth in cases where much moisture is present. 
This new growth takes the form of a tubular prolongation, and in some 
cases observed it has produced terminal conidia. In one instance two 
conidia were attached to this secondary prolongation. The wall of 
this secondary growth is lighter in color than the basal matured por¬ 
tion. As shown in Fig. 8, Plate xiii, these secondary growths become 
shouldered as with the matured basal part. They become septate, and 
are separated from the base by a distinct septum. The mature conidio¬ 
phores may also become sparsely septate. The attachment of the conid¬ 
ium to the conidiophore is very unstable. In some cases there is a 
membrane between the mature conidium and its conidiophore, which 
resembles a broad and short sterigma (Plate xi, Figs. 17 and 18). 
