Marshall Ward. — On a lily-disease. 327 
We may now pass to the description of some of the details 
of such a normal mycelium as that exhibited in Figs. 14-17, 
and first may be taken the shorter branches, which run up 
more or less at right angles from the main mycelium to the 
lower surface of the cover-slip, from which the whole culture 
is suspended ; and as I shall have a good deal to say about 
these peculiar branches, it will be necessary to describe them 
in some little detail. 
The first remarkable fact about them is that they grow 
vertically, or nearly so, until they come directly in contact 
with the glass cover-slip, their tips then flatten themselves on 
the glass surface, and soon afterwards they are found to be 
sticking to the glass so tenaciously that they cannot be re- 
moved without destroying them and their branches. They 
are clearly the bodies which have been described by De 
Bary 1 as ‘ Haft-organenl and I shall therefore term them 
organs of attachment. 
Any one of these organs is developed as follows. A branch 
rises nearly vertically from the mycelium hanging on the 
lower free surface of the culture-drop, and its tip swells as 
it comes in contact with the cover-slip ; if the culture-drop 
is very shallow, these club-shaped branches may meet the 
glass obliquely from the first. 
Soon after contact the organ is seen to have a bright spot 
at the centre of the attached portion, as shown in Fig. 20 at x, 
and in Figs. 22 and 24. Round this brilliant spot the walls 
of the hypha, closely pressed to the glass, gradually become 
thicker (as seen in optical section), and acquire a faint, 
brownish tinge. It is then seen that the outer contour is 
surrounded by a glairy film, as shown in Figs. 22 and 24. 
These appearances are not difficult to explain. I have 
drawn at Fig. 22 the tip of the organ of attachment as it 
would appear in profile, the double horizontal lines represent- 
ing the outline of the section of the cover-slip. Viewed from 
above in the direction of the arrow, we should see a pale, 
1 Comp. Morph, and Biol, of Fungi, etc., Engl, ed., p. 45. 
