ON VIOLA 



201 



Puccinia Violae DC. Flor. fr. vi. 62 (1815). Plowr. Ured. p. 152. 



Sydow, Monogr. i. 439. Sacc. Syll. vii. 609. Fischer, Ured. 



Schweiz, p. 139, f. 106. 

 P. Violarum Link, Sp. Plant, ii. 80 (1824). Cooke, Handb. p. 504 ; 



Micr. Fung. p. 210 ; Grevillea, iii. pi. 49, f. 5, 10 a, b. 



Spermogones. Crowded in little clusters, yellowish. 



JZcidiospores. iEcidia on all the green parts of the host, 

 on the leaves often forming swollen yellowish spots, generally 

 in roundish, or irregularly expanded, groups, on the stem some- 

 times scattered, flat, with a white irregularly torn revolute 

 margin ; spores delicately verruculose, orange, 16 — 24 x 10 — 

 18 yli. 



Fig. 149. P. Violae. a, leaf of V. silvatica with recidia ; b, teleutospore, 

 seen wet ; c, the same, seen dry ; d, a mesospore. 



Uredospores. Sori hypophyllous, scattered or circinate, 

 minute, soon naked, pulverulent, cinnamon-brown ; spores glo- 

 bose to ellipsoid, echinulate, brownish, 20—26 x 17 — 23 fi, with 

 two germ-pores. 



Teleutospores. Sori similar, but darker ; spores ellipsoid to 

 oblong, rounded at both ends or gently attenuated below, 

 thickened and paler above, hardly constricted, faintly punctate, 

 chestnut-brown, 20 — 40x15 — 23/a; pedicels hyaline, deciduous, 

 rather long ; a few mesospores are found. 



On all green parts of Viola canina, V. hirta, V. odorata, 

 V. Riviniana, V. silvestris. Very common. ^Ecidia, April- 

 June ; teleutospores, August — November. (Fig. 149.) 



The punctation of the teleutospores is very delicate, like little pin- 

 pricks, and can only be seen when they are dry ; these spores are generally 

 described as smooth and appear so except in the most favourable 

 circumstances. The germ-pore of each of the cells is covered with a paler 

 convex cap. The connection of all the spore-forms of this species was 



