ON GRAMINEA 263 
On Triticum vulgare. June—August. No ecidium is known 
to belong to it. (Fig. 200.) 
The Brown Rust of Wheat has been frequently so abundant in this 
country in its uredo-stage as to cause great loss. The uredospores can be 
distinguished from those of P. graminis, when both occur upon wheat, by 
being subglobose, not elongate-ellipsoid, and by the more numerous germ- 
pores which are scattered instead of forming an equatorial band ; also 
they appear early in spring, before those of P. graminis. Sometimes the 
teleuto-sori occur on the culms, and are then arranged more or less in 
lines, but they are most common on the underside of the “flag”; their 
spores germinate only after a winter’s rest. 
Mesospores are not frequent in this species. 
Klebahn tested the basidiospores of this 
Rust on forty-two likely species of plants 
in the hope of discovering an ecidium in 
its life-cycle, but without any result. The 
uredospores were found to be capable of 
surviving the winter by McAlpine in | 
Australia (where it is an introduced 7 4 
species), and by Carleton in the United 
Fig. 200. P. triticina. 
States south of lat. 40° N. “ Telepisesarn 
(4) Puccinia Houcina Erikss. 
Puceinia holeina Erikss. é.c. p. 274, pl. xiii, f. 22—5. Sydow, Monogr. 
i. 715. Klebahn, Zc. p. 249. Fischer, Ured. Schweiz, p. 365. 
On Holcus lanatus, H. mollis. June—October. Common. 
The uredo-stage must be carefully distinguished from that of P. coronata, 
which occurs on the same hosts ; the number of germ-pores at once decides 
the question. The uredo-sori are of a brighter colour than in the other 
forms of P. dispersa and stand upon conspicuous pale spots. The teleuto- 
spores are more rarely produced and require to be looked for closely ; they 
resemble those of P. triticina, but are mingled with a few mesospores. 
(5) PuccInia AGROPYRINA Erikss. 
Puceinia agropyrina Erikss., l.c. p. 273, pl. xii, f. 18—21. Klebahn, 
Zc. p. 249. Sydow, Monogr. i. 712. Fischer, Ured. Schweiz, p. 365. 
On <dgropyron caninum, A. repens. August—October. 
(Fig. 201.) 
This is one of the commonest of the Rusts on wild grasses in the 
autumn, and is easily recognised by the following points: The small 
scattered dull-orange uredo-sori on the upper leaf-surface; the round 
faintly echinulate uredospores, which when empty show a pale-chocolate 
