376 BROOKLYN BOTANIC GARDEN MEMOIRS 
1. Campanulae-rapunculoides Kleb. on Campanula rapunculoides and, 
in favorable cultures, on C. bononiensis, C. glomerata, C. 
glomerata var. dahurica, C. lamtifolia, C. latifolia, C. nobilis, 
Phyteuma orbiculare and Ph. spicatum; not on Campanula 
rotundifolia, nor C. trachelium. . 
. Campanulae-trachelii Kleb. on Campanula trachelium and, in favor- 
able cultures, on C. bononiensis, C. glomerata, C. glomerata var. 
dahurica, C. latifolia var. macrantha, C. nobilis, C. rapunculoides 
and Wahlenbergia hederacea; not on Campanula pusilla, C. 
rotundifolia nor C. turbinata. 
3. Campanulae-rotundifoliae Kleb. on Campanula rotundifolia and, in 
favorable cultures, on C. bononiensis, C. glomerata var. dahurica, 
C. pusilla, C. turbinata, Phyteuma orbiculare, Ph. spicatum and 
Wahlenbergia hederacea; not on Campanula rapunculoides nor 
C. trachelium. 
Wagner indicated the following additional races: 
4. Campanulae-Phyteumatis Wagner on Phyteuma spicatum. 
Campanulae-macranthae Wagner on Campanula macrantha (C. 
latifolia var. macrantha). 
6. Campanulae-patulae Wagner on Campanula rotundifolia and C. 
patula. 
Kklebahn, however, does not believe that these can be distinguished 
from the first three. It may also be noted that a number of plants 
occur as hosts for more than one race. 
Coleosporium Senecionis Fr. Wagner (168) first gave evidence of 
host specialization in this rust. Fischer (54) has also investigated the 
rust and the following races are indicated: 
I. Senecionis silvatict on Senecio silvaticus, S. viscosus and S. vulgaris 
(Senecionis | of Wagner). 
. Senecionis Fuchsii on Senecio Fuchsii and S. nemorensis (Senecionis 
II of Wagner). 
3. Senecionis subalpini on Senecio subalpinus (Coleosporium subalpinum 
Wagner). 
4. Senecionis doronici on Senecio doronicum. 
Melampsora Euphorbiae (Schub.) Cast. This rust, completing its 
life cycle on species of Euphorbia, has been studied by W. Miller 
(105, 106) who claims the existence of the following races: 
1. Euphorbiae-cyparissiae W. Miiller on Euphorbia cyparissias. 
2. Euphorbiae-exiguae W. Miiller on Euphorbia exigua. 
3. Euphorbiae-pepli W. Miiller on Euphorbia peplus. 
Melampsora Euphorbiae dulcis Otth. This autoecious rust on 
Euphorbia is very similar to Melampsora Euphorbiae. As a result of 
the experimental work of W. Miiller (105, 106) and Klebahn (91) two 
races are indicated: 
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