109 
several other genera: Botrytis (Beauverie and Guilliermond, 13); Alter- 
naria, Epicoccum, and Botrytis (Linder, 78); Inzengaea (Borzi, 23); De- 
matium, Botrytis, Oidium (Klécker and Schiorming, 75); Chaetomium 
(Zopf, 129, figs. 24, 25, A, B, Tab. 16). The phenomenon, as described, 
is always associated with senescence. Sclerotia are described by Bakke 
(6) and by Noack (87), who seem to have found them common on old straw- 
cultures, varying in length from 200 to 600 uw. I have not found them at all 
on straw, though on old rice-cultures they are abundant. Pyenidia and 
pycnoconidia, as seen by Ravn (91) in HZ. teres and as described by Bakke 
(6), I have not seen. 
CONIDIOPHORES 
On standard wheat-shoots —The conidiophores are in no sense clustered 
but arise singly as lateral branches, each from an ordinary mycelial cell, 
and differ from the mycelium chiefly in that they grow erect and straight 
instead of declined and crooked, and are darker in color than the mycelium. 
Usually this branch in its basal region is mycelium-like, but it rapidly 
thickens and darkens to true conidiophore character, and is usually 2.5 to 
5 win length. Sometimes the mycelial cell from which the conidiophore 
arises also darkens. The conidiophore-cells contain protoplasm, and the 
protoplast plasmolizes under the usual reagents. When mature the conid- 
Fic. 8. —H. No. 1, showing variation in conidiophores, geniculation, 
conidia-scars, and septation. 
