Jan. 1904] 
Cultures of Uredineae in 
19 
8. Aecidium hydnoideum E>. & C.—Coming upon some 
bushes of Dirca palustris L., the middle oi June, that were con¬ 
spicuous with great numbers of yellow aecidial spots, search was 
made for grass and sedge rusts in the vicinity. At one side, 
by a small ravine, was found a most luxurient growth of uredo 
upon Bromus ciliatus L., with last year’s teleutospores on the 
dead radical leaves. The most distant bush of rusted Dirca was 
not over a hundred feet away. 
As soon as suitable potted plants of Bromus ciliatus could 
be established in the greenhouse, aecidiospores from the Dirca 
were sown. The first sowing came to naught, as the host plant 
failed to grow well. A sowing on June 25 gave uredospores 
in abundance on July 4. Teleutospores were first observed on 
August 10, although they probably appeared somewhat earlier. 
The success of this trial removes another rust from that 
limbo of grass forms passing under the name of Puccinia rubigo- 
vera. We may characterize the species as follows, under the 
name 
Puccinia hydnoidea (B. & C.) nom. nov. ( Aecidium hydnoideum 
B. & C.) 
O. Spermogonia amphigenous in small groups on large yellow spots, 
inconspicuous, punctiform. 
I. Aecidia hypophllous, usually circinating about the spermogonia; 
peridia short, cylindrical, pale, margin slightly recurved, finely erose 
or torn; aecidiospores globoid or oblong-globoid, 11-15 by 14-19 fx ; wall 
yellowish, thin, 1 /z, minutely and inconspicuously verrucos'e. 
II. Uredosori chiefly epiphyllous, oblong, early naked, pulveru¬ 
lent, fuscous; uredospores globoid or obovate-globoid, 18-21 by 20-28 u ; 
wall brownish, thin, 1 //, abundantly echinulate, pores 4 or more, scattered. 
III. Teleutosori chiefly hypophyllous and caulicolous, small and 
numerous, oblong, covered by the epidermis; teleutospores linear-oblong, 
18-18 by 30-50 ju, truncate or oblique above, obtuse or slightly narrowed 
below, not constricted at the septum; wall smooth, light brown, thin, 
1-1.5 u, thickened at apex, 4-7 fi; pedicel very short, colored; paraphyses 
none, or few. 
This species, undoubtedly, does not embrace all the Ameri¬ 
can rusts on Bromus. It is, doubtless, the common form east of 
the Rocky Mts. Probably the multicellular form, found in Wis¬ 
consin and Minnesota, Puccinia tomipara Trel., is distinct, al¬ 
though it has not yet been shown that such irregular multiplica¬ 
tion of cells in the teleutospore is a permanent character. 
SUMMARY. 
The following is a complete list of successful cultures made 
during the season of 1903. It is divided into the two series: spe¬ 
cies previously reported by the writer or other investigators, and 
species now reported for the first time. 
