NOTES ON THE ERYSIPHACEAE 3 
borealis of Microsphaera euonymi, and a var. polemoniacearum of 
“ FE. lamprocarpa Lev.’ These two plants I have not seen, but 
the description given of the latter seems to show that it is a form 
intermediate between £. cichoracearum and £. galeopsidis. 
In Japan a very distinct new species of Uncinula, U. septata 
Salm, (69) has appeared. The species has been found in two local- 
ities, and in each case it is associated with Sphaerotheca lanestris 
(S. Kusano). 
From a geographical point of view, the record by Raciborski 
(60) of the occurrence of Ozdzum-forms in Java is noteworthy. 
The occurrence of the New World species, Sphaerotheca mors- 
uvae (Schwein.)—the American gooseberry mildew—in a garden 
at Ballymena, County Antrim, Ireland, in 1900, is of special in- 
terest (see '71, '72). The question of the possibility of its intro- 
duction from America is considered under the species. 
Two important papers dealing with the Erysiphaceae by Grant 
Smith and Neger have appeared. 
Grant Smith, in his paper, ‘‘ The Haustoria of the Erysipheae,”’ 
(77) has given a detailed account of the structure and development 
of these organs, and has added several interesting facts to our 
knowledge of the subject. While finding that the mature hau- 
storium contains almost invariably a single normal nucleus (as 
Harper had already stated), the author records an isolated case, 
where the haustorium of ‘“ Erysiphe communis” on Gerantum 
maculatum contained two nuclei. It was also found that occasion- 
ally haustoria have a septum in the neck portion. As has long 
been known, a mature haustorium is nearly always surrounded by — 
a thick sheath-like layer. The correct interpretation of this sheath 
according to Grant Smith, is different from that which has hith- 
-erto been given. De Bary was of the opinion that it belonged 
to the protoplasm of the host cell, while Harper (Pringsh. Jahrb. 
wiss. Bot. 29: 664), considered that this sheath is, as in the case 
of that of Puccinia, the disorganizing nucleus of the host cell. 
Smith says, however, that the sheath ‘“ does not belong to the 
protoplasm of the cell as de Bary supposed, nor is it the host 
nucleus as Rosen observed in Puccinia; but the contents of the 
sheath consist of disintegrated cellulose from the distal end of the 
cellulose ingrowth through which the haustorium has made its 
