98 SALMON: SUPPLEMENTARY 
In the examination of some U. aceris in the conidial stage on 
Acer campestre from Reigate, England, there was observed on all 
the leaves examined Oidium-like conidia much smaller than the 
normal Osdiume-conidia with which they were associated. I was 
not able to ascertain if these smaller conidia which measured 
about 15 x 7 #, were organically connected with the mycelium of 
the Uncinula, t. e., whether they were reaily microconidia, of 
whether they were merely accidentally present. The presence of 
some intermixed hyphae of foreign mycelium and loose Macro- 
sporium and other spores favor the latter view. The occurrence 
of these smaller Ordium-like conidia among the mycelium of U. 
acerts is of interest in connection with Fuckel’s original description 
of the conidia of U. Tulasnei (see monograph, p. 94). 
Rabenhorst (59) has recorded U. aceris on Acer monspessit 
lanum from Boriter in Kurdistan. Specimens so labelled were 
kindly sent to me by Dr. Hennings from Rabenhorst’s herbarium, 
but these bore only a barren mycelium. ; 
Neger (54, p. 338) states that the conidia of U. aceris vary ™ 
shape according to external conditions,—to quote his words: * Die 
Conidien zeigen je nach den Wachsthumsbedingungen (feuchter 
oder trockener Umgebung) verschiedene Gestalt ; in trockenet 
Luft entstandene Sporen sind lang und schlank, wahrend sie in 
feuchter Umgebung mehr abgerundete und gedrungene Formen 
zeigen.” 
U. prunastri (DC.) Sacc. (Monograph, p. 95) 
Distrib, add; Bulgaria (10), Poland (6). 
In Spegazzini’s herbarium a specimen occurs labelled “— 
Wallrothii f. lonicerae Xylostei, Belluno, Italy, 10. 8. 78; ro 
sime.” I had already (monograph, p. 97) expressed the opiniot 
that the presence of U. Prunastri on the host here given was " 
be considered only accidental, and an examination of these Sper 
mens of Spegazzini shows this view to be correct. We find bee 
that the perithecia—or at least many of them—are fixed upside 
down by means of the adherence of the mucilaginous apices © 
the appendages to the leaf of the Lowicera. This reversal and sit 
attachment of the perithecium is just what occurs in U. acer? (- 
monograph, p. 92), and has also been observed in several other 
species of the present genus (ante, p. 9). 
