274 BOTANICAL GAZETTE [MARCH 
Silver-leaf disease.—Brooxs* has investigated, through inoculation 
experiments, the silver-leaf disease of fruit trees and other plants, which is said 
to be more serious in England each year. As the name implies, the foliage of 
the host becomes silvery in appearance, in striking contrast with the dark 
green of healthy leaves. Stereum purpureum was reputed to be the causal 
organism, and inoculations of branches of plum trees with its sporophores 
resulted in silvering. The mycelium was also grown from spores in pure cul- 
tures and inoculations with it caused silvering. The conclusion seems safe that 
this parasite is the active agent in producing the disease in England.—J. M. C. 
Lodgepole pine forests.—From a study of the forests of Boulder Park, 
over 150 years old and forest fires have frequently occurred in the past. The 
close relationship found existing between fires and the occurrence of this species 
seems to agree with the conclusions of CLEMENTs presented in a paper recently 
reviewed in this journal.s* The presence of Engelmann spruce, especially in 
more moist situations, suggests that were the fires prevented the lodgepole 
pine would be succeeded by more mesophytic conifers —Gro. D. FULLER. 
Michigan fungi.—KaurrMan* has shown what can be done by some field 
study of fungi during a single season, and the season of 1910 in Michigan was 
far from favorable. There were discovered 15 species of Ascomycetes and 77 
species of Basidiomycetes hitherto unreported from the state. He has also 
stimulated the interest in observing fungi by the publication of outline keys . 
to the common genera of these fungi, for the ability to recognize a fungus helps 
to keep the interest alive. These keys, extending through 27 pages, form the 
bulk of the contribution, and should meet the immediate needs of those who 
do not have access to the larger publications —J. M. C 
Ophioglossum and Pinus.—Miss Sropes,*? in her examination of creta- 
ceous plants, has discovered that the impressions known as Ophioglossum 
granulatum do not represent that genus, and that the American specimens are 
staminate strobili of Pinus, the so-called “granules” being winged pollen grains. 
Accordingly the author gives the new name Pinus granulata, which may not be 
4 Brooks, F. T., “Silver-leaf” disease. Jour. Agric. Sci. 4:133-144. 
, KATHERINE, A study of the lodgepole ae ore ; ae 
bak eae Ca). Univ. Colorado Studies 8: 265-275. 
3° Bot. Gaz. 51: 234. 191i. 
% KaurrMan, C. H., Unreported Michigan fungi for 1910, with outline keys of 
the common genera of Basidineayoetes and Ascomycetes. Report Mich. Acad. Sci. 
215-249. IQII 
# Stopes, Marie C., On the true nature of the cretaceous plant Ophioglossum 
granulatum Heer. Ann. Botany 25:903-007. figs. 2. ro 
