158 British Uredincce and Ustilagincci". 



Uredo labiatariim, D. C. Grev,, " Flor. Edin.," p. 436. 

 Berk., " Eng. Flor.," vol. v. p. 378. Johnst., "Flor. Berw.," 

 vol. ii. p. 203. 



Exsiccati. 



Berk., 217, 232, 233. Cooke, i. 30; ii. 33, 60, 444. Vize, 

 " Fungi Brit," 14, 15, 75 ; " Micro. Fungi Brit." 



On MeJitha rotimdifolia, sylvestris, aquatica, arvensis^ viridis, 

 Origamun vidgare, Calamintha dinopodmm. 

 May to October. 



Biology. — The cecidiospore mycelium is diffused and probably 

 perennial —at any rate, lasting for more than one year ; at least, this 

 appears to be the case with M. viridis^ which I have cultivated for a 

 period of three years. The mycelium of the uredospores and teleuto- 

 spores is purely local. 



Johnoston records this species on Ajuga reptans. 



Puccinia segra. Grove 



^<;/^w<r/^;rj-— Pseudoperidia on all green parts of the ' plants, 

 scattered, not collected on swollen roundish or elliptical spots, 

 with torn, white, somewhat recurved margins. Spores roundish 

 or oblong, angular, smooth, orange-yellow, 17-21 x 14-16/A. 



Uredospores — Sori numerous, amphigenous, on yellow spots, not 

 very small, scattered or collected in groups, roundish, flatly 

 convex, covered with the silvery, shining, persistent epidermis. 

 Spores elliptical or obovate, finely echinulate, brown, 28-30/x. 



Teleutospoi-es—?)Ox\. resembling those of the uredospores. Spores 

 elliptical, oblong, or roundish, very irregular, rounded or taper- 

 ing at the base or apex, sometimes truncated, smooth, not 

 constricted, dark brown, 22-30 x 18-241^. Pedicels short, 



hyaline. 



Synonyms. 



Puccinia cegra. Grove, /our. of Bot, vol. xxi. (1883), p. 274. 

 ^cidium depmiperatis, Vize. Cooke, " Micro. Fungi," 4th 



edit., p. 195. , 



Exsiccati. 



Vize, "Micro. Fungi Brit.," 56. 



On Viola cormita, lutea var. amcena. 

 May to September. 



