336 BOTANICAL GAZETTE [OCTOBER 
Battey.” The former had already concluded that in the primitive angiosperms 
the vascular supply of the leaves arose as three strands. It is now found that 
such leaves are usually provided with stipules, the vascular supply of which is 
connected with the lateral leaf traces; where there is a single leaf trace at the 
node, stipules are absent, but if the leaf is supplied by many strands it has a 
sheathing base. It is further observed that leaves with an entire margin 
generally have no stipules, even though three strands supply the leaf. Stipules 
are regarded as an integral part of a leaf, and are homologous with sheaths, 
ligules, and similar modifications of the base of the petiole —M. A. CHRYSLER. 
Scientific phytopathology.—APreEL presented a paper at the twenty-fifth 
anniversary celebration of the Missouri Botanical Garden which has just been 
published,3° dealing with the scientific aspects of plant pathology. This point 
of view is rapidly developing in this country, but still needs to be emphasized. 
As APPEL states, until recent times there were no places where scientific phyto- 
pathology was taught. The thesis of the paper is illustrated by the biological 
x 
on the air content of host tissues, the work in physiological chemistry, and 
ae the histological study of the host tissues involved —J. M. C. 
new genus of Erysiphaceae.—Iro* has described a new genus 
A eect of Erysiphaceae from Japan, parasitic on Quercus glandulifera. 
The asci are several in the globose perithecium, and 8-spored; while the append- 
ages are simple and clavate. The conidia have not been observed. The genus 
is most closely related to Erysiphe, but differs in its appendages.—J. M. C. 
2 Sinnott, E. W., and Batzey, I. W., Investigations on the phylogeny of the 
angiosperms 3. Nodal anatomy and the morphology of stipules. Am. Jour. Bot. 
1:441-453. pl. 44. 1914. 
x Appet, O., The relations ike scientific botany and phytopathology. 
Annals Mo. Bot. Gard. 2:275—285. 1915. 
# Tro, Serva, On Typhulocaeta, a new genus of Erysiphaceae. Bot. Mag. Tokyo 
29:15-22. pl. 7. 1915. 
