Oct. 8, 1917 
Endrot of Cranberries 
37 
The pycnidia in culture are ovoid to globose or depressed globose with 
simple or irregular labyrinthiform chambers, erumpent or subsuperficial, 
500 to 800 ju in 
diameter. The 
inner wall of the 
pycnidium is sor¬ 
did yellowish and 
the pycnospores 
somewhat more 
variable in their 
extreme measure¬ 
ments than in 
specimens found 
on old cranberries, 
under natural con¬ 
ditions, but aver¬ 
aging about the 
same size. Fig¬ 
ure 1 shows sec¬ 
tions of pycnidia 
and Spores from a Fig. I. — Fusicoccum pulrefaciens: a, Vertical section of a simple pycnidium 
pure Culture of the £ rown m pure culture on sterile sweet clover stems ( Melilolus alba); b, verti- 
. cal section of a chambered pycnidium from a com-meal-agar culture, X 43.5; 
lungus. When c, part of a section of a showing sporophores and spores; d, separate sporo- 
matUre, the apical pk° res and spores from pure culture, X 420. 
portion of the pycnidium ruptures more or less irregularly, permitting the 
escape of the pycnospores which are expelled in a mucilaginous whitish 
mass. Later more or less of the top 
breaks away as shown in figure 2, a. 
The pycnidia appear to be produced 
but rarely under natural conditions in 
the field, as they have been found 
only twice, although thorough search 
of diseased bogs and all parts of the 
cranberry plant has frequently been 
made. In a careful examination of a 
large number of dried rotten berries 
from a pile of discarded fruit about a 
Fig. 2.— Fusicoccum pulrefaciens: a. Median ver* year and a half old at the MaSSachu- 
ticai section of a pycnidium growing in the angle setts Cranberry Station, a consider- 
beneath the old calyx lobe of an old rotten . 
cranberry, x 43.5; b, similar section of a two- able number of mummied berries were 
chambered pycnidium, with part of the apical found, having a dirty yellowish color 
portion gone, X 435; e , portion of inner wall of a . 
pycnidium, showing simple and branched sporo- Suggestive OI that produced by the 
phores with immature spores; d, separate endrot fungus. On one of these berries 
pseudoseptate spores, X 420. 
four or five pycnidia bearing spores 
were found hidden beneath the old shriveled calyx lobes. Figure 2 
shows sections of two of these pycnidia, a the simple form and b the 
