156 
Journal of Mycology 
[Vol. 10' 
NOTES FROM MYCOLOGICAL LITERATURE. X. 
W. A. ICELLERMAN. 
"Professor Oudemans' XIX Contribution a la Flore My- 
cologuique des Pays-Bas is a publication of unusual interest and 
importance. [Overdr. Ned. Kruidk. Archief. 3e Serie II, 4. pp. 
851-928.] He enumerates 159 species nearly all being new to that 
region, and 74 of the species are new to science. In a series of 
4 colored lithographic plates eleven of the new species are illus¬ 
trated. Three of the described species are Pyrenomycetes, six 
Phycomycetes, and the remainder are Sphaeropsideae. We notice- 
two new genera, one of Mucedine^e, namely, Haplariopsis, and the 
other of Dematieae, namely, Torulopsis, each with a single species. 
P. H. Rolfs discloses the results of his studies on 
Withertip and other Diseases of Citrous Trees and fruits in 
Bulletin No. 52, Bureau of Plant Industry, U. S. Department of 
Agriculture, illustrated by six full-page plates. He shows that 
Withertip, Anthracnose, Leaf-Spot, Lemon-Spot, and Canker are 
caused by Colletotrichum gloeosporioides Penzig. These destruc¬ 
tive diseases were unknown in Florida until a comparatively recent 
time. A description of the fungus is given, also the synonomy, 
and preventive and remedial measures. 
Fred Mutchler gives a list of 86 species of Myxomycetes 
of Lake Winona — a long list for one season’s collecting in that 
vicinity, but the season was said to be very favorable for the study. 
It is published in the Proceedings of the Indiana Academy of 
Science 1902 (issued in 1903), and forms one of the sections of 
Contributions from the Zoological Laboratory of Indiana Univer¬ 
sity under the direction of C. H. Eigenmann, No. 53. 
Lack of space precludes a full account by Ernest S. 
Salmon of Cultural Experiments with Barley Mildew, Erysiphe 
Graminis DC., Ann. Mycolog. 2170-99, Jan. 1904, but mention 
will be made of “sub-infection,” i. e., the fungus never produces 
powdery patches of Oidium, but only a few conidiophores which 
die away after a few days. . . “Further, in connection with 
the hypothesis,which I have lately put forward that the leaf-cells 
of the host-plant of a ‘biologic form’ contain an enzyme which is 
destructive to the growth of the haustorium of any other ‘biologic 
form,’ it is conceivable that the amount of the enzyme contained 
in each epidermal cell may be sufficient to render it capable of 
destroying the first and perhaps even the second haustorium, but 
that successive haustoria invading the same cell may find the 
enzyme used up or insufficient to stop their growth. Under these 
circumstances a conidium here and there would be able to develop 
its first haustorium in a cell of the plant, and as this first haus¬ 
torium soon grows enormously in size and branches out into 
