236 British Uredinee and Ustilaginea. 
to the foliage of the mountain ash, give rise to the spermogonia in 
from eight to fifteen days. 
I have failed only twice in thirteen cultures, and I had to experi- 
ment with material sent from Scotland. Rdthay states (“Spermo- 
gonien der Rostpilze,” 1882, pp. 20-22) that the aecidiospores of this 
species also occur on Pyrus aria, malus, and Amelanchier vulgaris. I 
have applied the promycelial spores to quince (P. vdgaris) in three 
experiments, to apple (P. madus) and to beam (P. aria) in one, but 
without success. 
In the spring of 1884, a patch of spermogonia appeared on a 
mountain-ash, which had borne the zcidiospores in 1883; this is the 
only instance in which I have seen the mycelium of the zcidiospores 
survive the winter. Probably this arose from a bud being infected 
late the previous year. From the fact of my being unable to produce 
the zcidiospores on the host-plants with which Rdthay succeeded, 
viz. Pyrus malus and aria, it is clear that in Europe we have a second 
species of Gymnosporangium on Juniperus communis, namely G. tre- 
mellotdes, Hartig. (Lehrb. d. Baumk, p. 55). 
MELAMPSORA. Castagne. 
Teleutospores unicellular or rarely multicellular from transverse 
or longitudinal cleavage, in compact flat sori or crusts. Germina- 
tion by a promycelium, as in Puccinia. Uredospores single, formed 
on sterigmata. 
The Czeomata are considered by many botanists the zecidiospores 
of this genus. The promycelial spores, when applied to the teleuto- 
spore host-plant, do not give rise to the uredospores. 
I. MELAMPSORA. 
Teleutospores formed outside the epidermal cells of the host-plant, and re- 
maining single. 
Melampsora helioscopie. (Pers.) 
Uredospores—Sori small, roundish, or irregular, soon pulverulent. 
Spores elliptical or ovate, finely echinulate, orange-yellow, 
14-23 X 10-174. Paraphyses abundant, between the spores, 
capitate, hyaline, 15-18, broad. 
Teleutospores—At first deep orange, then blackish brown, rounded, 
on the stems elongate, scattered. Spores cuneiform, cylindrical, 
or prismatic, in section polygonal, dark brown, simple, inter- 
cellular, 30-35 X 12-18p. 
