Fig. 
Fig. 
Fig. 
Fig. 
Fig. 
Fig. 
Fig. 
Fig. 
Fig. 
Fig. 
Fig. 
E.- J. BUTLER. 25 
none on two of the florets ; st. stamens variously altered, and with 
two suppressed in the floret on the right; s. prolificated shoots 
arising within and above the staminal whorl. In the left 
hand floret this was a simple horn. In the others it consisted 
of some contorted reduced leaves, which have been in part 
dissected out in the two right hand florets. 
Diagram showing the position occupied by the fungus 
mycelium in the mesophyll of the leaf of Pennisetum. 
Piaie IV. 
Contorted leaf bud of Pennisetum typhoideum affected 
with Sclerospora. 7 
Leaf shredding in Andropogon Sorghum affected with 
Sclerospora. 
Leaf shredding in Setaria italica affected with Sclerospora. 
Section of an infected leaf of Pennisetum showing the dis- 
"tribution of the fungus hyphe in the mesophyll and adjoining 
the bundle sheath. 
A leaf bundle distorted as a result of the action of the 
parasite in causing collapse and flattening of the mesophyll cells. 
Plate V. 
Haustoria of Sclerospora graminicola in the mesophyll cells 
of an infected leaf of Pennisetum. On the left simple and branch- 
ed finger-shaped haustoria, the type which predominates in the 
leaf. On the right two club or button-shaped haustoria, a type 
more commonly seen in the stem. X 500. 
Old haustoria with a distinct cellulose cap. X 500. 
Intracellular hypha, showing the wall of two layers, the outer 
of which connects with the cell wall and belongs to the host plant. 
X 500. 
a. Intracellular hypha running obliquely across two cells. 
Note the very thick wall and almost occluded lumen; b. b. peg 
like processes projecting into the cells, but arrested in further 
growth by the deposition of a thick cellulose cap. X 500. 
Conidiophores of Sclerospora graminicola from Pennisetum 
after the sporangia have fallen, showing the mode of branching. 
X 400. 
Conidiophores bearing immature sporangia. X 400. 
Conidiophore with mature sporangia. X 400. 
