150 REPORT OF THE BOTANIST OF THE 
Aderhold,° in 1898, observed Cephalothecium roseum intimately 
associated with scab, Fusicladium pirinum, on pears in Germany. 
Although he, too, made no inoculation experiments, he expressed 
the opinion that in the case observed by him the Cephalothecium 
was really the cause of the rot. He confirmed Zschokke’s obser- 
vations that the fungus does not extend deeply into the flesh of 
the fruit, but confines its attacks chiefly to the surface layers.® 
Because of this character he named the rot “ Schalenfaiile ” 
(peel-rot) .” 
The spores of the fungus are borne at the tips of erect stalks, 
technically known as conidiophores. These grow from the 
mycelium, that part of the fungus which penetrates the tissues of 
the fruit and causes the rot. Both the spores and the conidio- 
phores are colorless, except when old and seen in mass. They 
then have a pinkish color. The spores, which are two celled, 
are various in size and shape. Usually they are oblong-obovate 
and slightly constricted at the septum. (Plate XVII, Fig. 1.) 
As we have found them they measure 16 to 28, in length by 8 to 
14 in width, the most common size being 21 by 10 1». 
Devaine stated that the fungus grew when inoculated into liy- 
ing leaves of certain plants, and Aderhold® has observed it on 
the leaves and living twigs of pear. This suggested that it may 
be present on apple leaves, especially those affected with scab, 
but we did not find a case where such a condition existed. We 
have looked for it on the twigs and limbs of apple trees, but have 
been unable to find it. On October 8th it was reported to us as 
growing on healthy maple trees? on Long Island. (Plate XVII, 
Fig. 4.) This suggests that it may be parasitic on maple trees. 
Investigations to determine this will be made during the season 
of 1903. 
5Aderhold, Rud. Arbeiten der botanischen Abteilung der Versuchsstation des Kel, dons 
logischen Instituts zu Proskau. Centralbl. f. Bakteriologie, etc. Zweite Abt., 5: 522. 1899. 
6This observation has been confirmed by the writer with affected apples that were left in 
moist chambers for a month. 
7By fruit growers and apple buyers the rot is often called ‘‘canker,”’ but this name is objec- 
tionable and should be abandoned since it is the generally accepted name of a common disease 
affecting apple limbs (See Buls. 163 and 185 of this Station). Craig and Van Hook (Cornell 
Exp. Sta. Bul. 207) have proposed the name ‘Pink Rot,’’ which is probably as appropriate 
as any that can be found. 
8Aderhold, Loe. cit. 
*The complaint came from a nurseryman. The following is a part of his letter: “I am 
sending you a specimen of mildew on the trunk of Norway maple. The disease attacks sound 
old trees, without wounds, killing the bark.” 
