Oct. 8, 1917 
Endrot of Cranberries 
39 
base and the same relation to the tissues of the host. Unfortunately as 
yet no cultures from ascospores have been obtained, as all the specimens 
collected have been too old or poorly developed. This fungus agrees 
very closely with Cenanginm urceolatum Ellis (1, p. 9) 1 found on twigs of 
Clethra alnifolia in New Jersey and distributed in Fungi Columbian! No. 
742 and North American Fungi Exsiccati No. 990. The author states 
(1, p. 9) that Sphaeronema clethrincola Ellis is the stylosporous form of 
this species. This statement is apparently based on the close associa¬ 
tion of the two forms on the same specimens, which may easily be mis¬ 
leading. The writer's suggestion made above in regard to the relation 
of the endrot fungus to this Discomycete may, however, have but little 
more value than that of Ellis. It is recorded here for the purpose of 
calling attention to this fungus, and perhaps thereby securing fresh 
material with viable ascospores from which pure culture studies may be 
made, and its life history positively determined. 
CULTURAL CHARACTERS 
The endrot organism grows well on corn-meal agar, potato agar, 
steamed corn meal, and stems of MelUotus alba . It fruits more frequently 
on stems than on the other media mentioned. 
The superficial growth of the fungus is at first pure white, soon becom¬ 
ing pale green-yellow 2 to pale yellow-green, passing through La France 
pink to Mars orange, as indicated in Plate A, figure 8, which shows the 
appearance of a culture 39 days old on cranberry agar-gelatin. 
On steam-sterilized stems of MelUotus alba the growth passes through 
the same shades during its early development, but finally becomes 
nopal-red or even garnet-brown in spots, as indicated in Plate A, figures 
6 and 7, which show the appearance of cultures 46 days old. 
On corn-meal agar in petri dishes colonies 12 days old observed by 
transmitted light are white at the margin, passing through pale lemon- 
yellow and lemon-chrome to orange-citrine at the center and when 
older on slant agar tubes of the same medium produce colors very similar 
to those shown in Plate A, figure 8. 
CONTROL OF THE DISEASE 
As already stated, endrot does not usually show much evidence of 
its presence in the fruit before picking. The time and manner of infec¬ 
tion have not yet been positively determined. From the fact that spray¬ 
ing during the growing season greatly reduces the rot, which usually 
develops after picking, it seems probable that infection occurs before the 
fruit is mature and that the fungus is in the berries in a dormant or 
slowly incubating condition when they are picked. 
1 Reference is made by number to 41 Literature cited,” p. 41. 
2 The nomenclature of colors in the description of the cultures is according to Ridgway. (Ridgway, 
Robert, color standards and color nomenclature. 43 p., 53 col. pi. Washington, D. C., 191a.) 
