UTAH ACADEMY OF SCIENCES 135 
heteroecious, having the teliospores on some Gymnosperm, 
usually of the cedar group, and the aecial stage on some 
ligneous species of the Malaceae. But there are several 
radical exceptions to this statement. For instance, Gymno- 
sporangium bermudianum (Farl.) Seym. & Earle is autoeci- 
ous, having both spore-forms on species of Juniper. The 
aecia of Gymnosporangium exterum Arthur occur on 
Gillenia stipulacea, an herbaceous annual belonging to the 
family Rosaceae, and those of Gymnosporangium gracilens 
(Peck) Kern & Bethel are found on Fendlera rupicola and 
species of Philadelphus, two hosts belonging to the family 
Hydrangiaceae. But still farther removed from the 
Rosaceae is the host of the aecial stage of Gymnosporan- 
gium Ellis (Berk.) Farlow, which occurs on Myrica ceri- 
fera and M. carolinensis belonging to the family Myricaceae! 
Each teliospore of the Gymnosporangia commonly has 
two germ-pores to each cell; but in the species G. multi- 
porum Kern, recently described from Colorado, there are 
from five to seven (usually the latter number), to each 
cell. 
Still another perculiar Gymnosporangium is G. Blas- 
daleanum (Dietel & Holway) Kern. This species has in 
the aecial stage, not the usual so-called Roestelia, but the 
genuine aecium. The aecia of Gymnosporangium Ellisti 
(Aecidium myricatum Schw.) also has this unusual charac- 
teristic. 
The number and arrangement of the germ-pores is be- 
coming an important diagnostic character in the rusts, 
especially in connection with the uredo-spores of the dif- 
ferent species. Uromyces uniporulus Kern and Puccinia 
uniporula Orton, two rusts found on Carex, are unusual in 
that their uredospores have each only one germ-pore, while 
those of all other known species of rust on Carex have at 
least two. Puccinia karelica is an unusual sedge rust in that 
it is the only known sedge rust with scattered germ-pores, 
all other known species having equatorial, super-equatorial 
or subequatorial pores.* 
1Arthur and Fromme: “The Taxonomic Value of Pore Characters in 
the Grass and Sedge Rusts.” Mycologia 7:28. 1915. 
