164 
Journal of Mycology 
[Vol. 12 
forms are connected for the following reasons: First, the two 
hosts are intimately associated in growth. Second, the appear¬ 
ance of the Caeoma antedates that of the Melampsora. Third, 
the Melampsora occurs on those willow branches low enough to 
brush against the Ribes bushes, or else to be easily infected by 
the wind. Fourth, during the latter part of the season of 1905, 
whenever an infected Salix was found, search was made for the 
Ribes bush and then for defunct aecidia, almost invariably with 
successful results. Fifth, the Salix goes to the mouth of the 
Canyon, but the Ribes accompany them less than half-way. 
When the Ribes stops, the Melampsora also stops. 
NOTES FROM MYCOLOGICAL LITERATURE, XX. 
W. A. ICELLERMAN. 
R. A. Harper's work on Sexual Reproduction and the 
Organization of the Nucleus in Certain Mildews is Publication 
No. 37 of the Carnegie Institution of Washington, pp. 1-104. PI. 
I-VII, September 1905. Of this interesting and important in¬ 
vestigation no brief summary can be made, but the author’s con¬ 
ception as to alternation of generations in the higher fungi may 
be quoted in part. “In the rusts we have sexual reproduction by 
vegetative fertilization. The fusing cells are perhaps morpho¬ 
logically vegetative offshoots of an egg-cell. ... In the 
Basidiomycetes by apogamy sexual cell fusion may have disap¬ 
peared or we may have vegetative fertilization. ... In the 
Ascomycetes we have sexual reproduction and alternation of gen¬ 
erations, modified by the adaptation of the spore mother cell as an 
explosive organ for the dissemination of the spores and as a stor¬ 
age reservoir for the production of resting spores with a large 
supply of metaplasmic reserve products.” . . . 
C. L. Shear gives an account of some out-door in¬ 
oculations made in the Spring of 1902, under the title of Peri¬ 
dermium cerebrum Peck and Cronartium quercuum (Berk,), pp. 
89-92, Journal of Mycology, Volume 12, May 1906. On May 
1st aecidiospores of Peridermium cerebrum (from Pinus vir- 
giniana) were successfully applied to Quercus coccinea — uredo 
sori appearing May 12. Shirai has by inoculation proven the 
connection between Cronartium gigantium (Mayr) Tubeuf find 
what he calls Cronartium quercuum (Cooke) Miyabe. Mr. Shear 
is of the opinion that Peridermium gigantium (Mayr) Tubeuf is 
the same as P. cerebrum Peck described many years earlier. 
The North American Species of Heliomyces —6 in num¬ 
ber—are grouped and diagnosed in the Journal of Mycology for 
