ON LABIATA 171 
Puccinia Menthae Pers. Syn. p. 227. Cooke, Handb. p. 496; Micr. 
Fung. p. 204 p.p., pl. 4, f. 69, 70. Plowr. Ured. p. 157. Sace. 
Syll. vii. 617. Sydow, Monogr. i. 282. Fischer, Ured. Schweiz, 
p. 168, f. 131. McAlpine, Rusts of Australia, p. 140, f. 250. 
P. Clinopodti DC. ; Cooke, Micr. Fung. p. 205 (?). 
Spermogones. Scattered or arranged in little groups, honey- 
coloured. 
4icidiospores. Aicidia hypophyllous and often on the 
stems, arranged on the leaves in clusters on orange or purplish 
spots, or forming elongated patches on the stems and petioles 
which are much thickened and deformed, opening irregularly, 
margin scarcely torn, erect or even incurved ; spores verruculose, 
pallid-yellow, 24—40 x 17—28 pu. 
Uredospores. Sori hypophyllous, on yellowish or brownish 
spots (or without spots), minute, roundish, scattered or aggre- 
gated, soon naked, surrounded by the ruptured epidermis, 
sometimes confluent, cinnamon; spores globose 
to obovate, echinulate, pallid-brown, 17—28 x 
14—19 p, with three equatorial germ-pores. 
Teleutospores. Sori similar, but dark-brown; 
spores subglobose to obovate, rounded at both 
ends, with a broad pale-coloured apical papilla, 
not or scarcely constricted, more or less in- 
distinctly verruculose, sometimes smooth, dark- 
brown, 26—35 x 19—23; pedicels hyaline, Fig. 121. 
slender, longer than the spore. P. Menthae. 
. : , Teleutospore 
On Mentha aquatica, M. arvensis, M. citrata, on M. aquatica. 
M. rotundifolia, M. silvestris, M. viridis, Ori- 
ganum vulgare, Calamintha Clinopodium, C. officinalis. May— 
October, teleutospores from August. Very common on garden 
Mint, rather common on some of the other species. (Fig. 121.) 
There can be little doubt that this is a collective species. Points of 
difference are found in the finer or coarser warts of the teleutospores and 
in the length of the pedicel ; but hitherto no certainty has been arrived at 
in delimiting the various forms. I have seen the warts quite distinctly on 
some of the teleutospores on V. aquatica and M. arvensis, when they are 
viewed dry, but other spores in the same sorus seemed perfectly smooth. 
The xcidium seems not.to occur on all species, though it is common on 
