116 
Fic. 13.—Conidia of H. No. 1: 
a, showing septa from two 
depths of focus; b, two germinat- 
ing conidia with germ-tubes 
anastomosing. 
always, shrinkage of the protoplasts such as is shown in Fig. 11, this shrink- 
age being usually most pronounced in the end of the conidium showing most 
vigorous growth. To all appearance the endosporium serves as a stored 
food and is consumed in germination, since its presence in much diminished 
quantity in germinated conidia is evident when such conidia are crushed. 
The conidiophore-cells also occasionally function as conidia by sending 
out a germ-tube. Here, too, the inner cell-wall seems to serve as reserve 
food. 
Longevity of conidia.—It is not known how long conidia live, but on 
wheat straw that had remained air-dry for fourteen months they germi- 
nated normally. Noack (87) mentions germination ‘‘after many months.” 
Ravn (91) says of three species that at eight months they germinated but 
sparingly or not at all. 
Frequency of conidial septa—H. No. 1 under standard conditions (see 
appendix, page 180) gave the graph in Fig. J, while similar data for H. Nos. 
13-16 are given in Fig. T. 
