1898] CURRENT LITERATURE 443 
An extended account of the structure and occurrence of some new 
species: Phleospora Jaapiana, from Germany,° Aecidium Opuntia from 
Bolivia,? and Aecidium Jacobsthalii-Henrict from the Straits of Magellan,® 
with fine detailed illustrations in each case, gives much information beside 
the usual diagnoses. 
In 1897 Dr. Magnus traveled in the United States, and he took the 
opportunity to make observations upon the lilac mildew ® so familiar to every- 
one in this country, and especially to all pupils in college classes in botany. 
In Europe the lilac is free from mildew, only one collection being recorded, 
and that proved to be Microsphera Ehrenbergii Lev., a common species 
on Lonicera tartarica. The American form was for a time referred by 
American botanists to J/. Fries? Lev., but since the study of it by Burrill in 
the preparation of his article on the Parasitic Fungi of Illinois, it has been 
called Mf. Adni(DC.) Wint. Dr. Magnus shows that although it is very 
closely related to JZ. A/ni of Europe, yet there are some morphological 
differences which indicate that it is geographically modified, and entitled to 
a separate name. Priority requires that it be called J. Syringe (Schw.) 
Magn., which he considers unfortunate in view of the fact that the American 
forms upon Betula, Corylus, Castanea and Ilex must also be placed under it, 
all being native plants while Syringa is introduced, and is therefore a com- 
paratively recent host for it. Attention is called to the fact that so far no 
cultural studies have been made among the Erysiphez to determine relation- 
ship. 
While in this country Dr. Magnus read a paper at Toronto before the 
British Association for the Advancement of Science upon the mycelium of 
witches’ brooms of the barberry ® in Europe. It had been asserted by Eriks- 
son that the mycelium of this Aecidium penetrates the cells of the host, and 
develops colored granules within, both being exceptional for members of 
the Uredinez, but both claims are shown to be errors. This 1 the Aecidium 
of Puccinia Arrhenatheri (Kleb.) Eriks. 
In a short communication to Hedwigia on Puccinia Lycii Kalchbr.," some 
€rrors in the original description are noted, and also an increase in the 
number of pores of the uredospores corresponding to an increase in size. 
°Eine neue Phleospora. Hedwigia 37: a as - 
7Eine neues Aecidium auf Opuntia sp. aus Bolivia. 
16: 151-154. 1898. 
®Ein auf rhigiea auftretendes Aecidium von der Magellanstrasse. mm 
deutsch. Bot. Ges. 15; 
Ges. 
9 Der — se Sethe ga vulgaris in Nordamerika. Ber. d. deutsch. Bot. 
16 : 63-70, 
On spn graveolens (Shuttlew.), Ann. Bot. 12: sescee 
‘Ber d. deutsch. Bot. Ges. 
d, 
1898. 
dw. 37: 
kleiner Beitrag zur Kenntniss der Puccinia Lycit Kalchbr. Hedw. 37 
1898. ° 
* Kin 
Beiblatt 91-93. 
