ON GRAMINEZ 269 
I have found that in many cases only one cluster is formed (or at 
most two small ones) on a leaf; this probably indicates a scarcity of 
active basidiospores. In other localities, however, eight or ten clusters 
may be found on a single leaf. This ecidium must not be confounded 
with Caeoma Alliorum, which belongs to the Melampsore. 
(4) Puccinia PHauaripis Plowr. 
eidium Ari Desm, Cat. Plant. omis. p. 26. Cooke, Handb. p. 545 ; 
Micr. Fung. p. 199. 
Puccinia Phalaridis Plowr. Journ. Linn. Soc. 1888, xxxiv. 88; Ured. 
p. 166. Sydow, Monogr. i. 783. 
P: Art-Phalaridis Kleb. in Pringsh. Jahrb, 1899, p. 399. Fischer, 
Ured. Schweiz, p. 344, f. 252. 
Spermogones. Epiphyllous or a few hypophyllous, dark 
honey-coloured, in roundish groups. 
Ajeidiospores. Aicidia hypophyllous, in roundish clusters 
(often surrounding a little group of 
spermogones), on conspicuous pale- 
yellow spots, cup-shaped, with a broad 
cut white revolute margin ; spores deli- 
cately verruculose, yellow, 15—26 p. 
Aicidia on Arum maculatum, Not 
common. May—July. (Fig. 205.) 
The same remark may be made about the 
occurrence of this as about the preceding form. 
The three latter races are biologically quite dis- 
tinct in so far that, in experimental cultures, 
each of them will produce the ecidium only 
on that particular genus to which it has Fig. 205. P. Phalaridis. 
i Aicidia on Arum 
become accustomed. This has been abun- maculatum. x}. 
dantly proved by Plowright, Klebahn, Fischer, 
Dictel and others. But the groups of zcidia are exactly of the same type 
in each case, and must have had a common origin in the past. 
124. Puccinia Anthoxanthi Fckl. 
Puceinia Anthoxanthi Fckl. Symb. Myc. Nachtr. ii. 15. Plowr. Ured. 
p. 194. Sace. Syll. vii. 665. Sydow, Monogr. i. 727. Fischer, 
Ured. Schweiz, p. 261. McAlpine, Rusts of Australia, p.°115, 
f. 20—1. : 
