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1896] BRIEFER ARTICLES 331 
After germination of the conidium, the fungus grew rapidly, 
branching in every direction, and whenever an upright hypha came in 
contact with the cover of the shallow Petri dish (5.5™" inside depth) 
repeated branching took place as in case of the conidiophores. As the 
organs increased in size the branches became shorter so that ultimately 
they were of no larger size than ordinary conidia of this species. The 
successive stages in the development are represented in figs. 3-6. 
ig. 3 shows the condition of things at 3:15 P.M.; fig. ¢ at 4:15 P.M.; 
fig. 5 at 5:07; and fig. 6 at 6 p.m. of the same day. After this the 
branching became so rapid and the organ so complex that accurate 
drawings were out of the question. 
When we compare the successive stages in the development of the 
conidiophores and organs of attachment, we find them essentialiy alike 
in origin and mode of branching, but ultimately in the case of the 
developing conidiophore the tips swell and peg like projections are sent 
out which grow and become mature conidia, while in case of the organ 
of attachment the branching continues irregularly and indefinitely. 
Farther, when conidia are sown in nutrient solutions germ tubes are 
sent out, and when a nutrient solution is supplied to one of the organs 
of attachment each ultimate division sends out a tube resembling a 
germ tube. In both cases these hyphe branch and develop into a 
complex mycelial mass. The resemblance therefore is a physiological 
as well as a morphological one. 
The connection between conidiophores and organs of attachment 
is farther emphasized by the intermediate forms found in almost every 
culture. Fig. 7, drawn accurately, as the others are, with the camera 
lucida, represents a prostrate branch with a young organ of attachment 
at 4, and short, erect branches bearing conidia at a. It was a com- 
mon occurrence for a hypha to bear conidia in successive clusters until 
it came in contact with the cover of the Petri dish, when it produced an 
organ of attachment. 
_YP to this time the organs of attachment were studied under arti- 
ficial conditions, but later attention was directed toward their formation 
and significance in nature. Leaves in connection with vigorously 
growing plants were tied in such a manner as to be from 2-4"" above 
€ach other, conidia having been sown previously, either in a small drop 
of water or malt solution, on the under leaf. The plants were then 
Placed in an atmosphere saturated with moisture, under a large bell 
ar. In no case was penetration observed where conidia were sown in 
