A utcitpuccinia. 1 6 1 



Puccinia vincae. (D. C.) 



Spennogonia — Scattered over the whole leaf-surface and stems, 

 yellow, sweet-scented. 



yEcidiospores — Sori pulvinate, not cup-shaped, but discoidal, solid, 

 2-3mm. in diameter, dark brown, with a greyish lustre. Spores 

 globose, finely echinulate, colourless, 10-12/A in diameter. 



Uredospores — Primary : Sori irregular, elongate, crowded, soon 

 naked and often confluent, brown, occurring with the spermo- 

 gonia and aecidiospores. Secondary : Sori on roundish brown 

 spots, brown, long covered by the epidermis. Spores sub- 

 globose, or obovate, brown, echinulate, 20-38 x 1 8-25/^1, 



Teleidospores — Sori small, on discoloured spots, roundish, scattered, 

 surrounded by the ruptured epidermis, blackish. Spores 

 elliptical or oval, slightly constricted, lower cell sometimes 

 attenuated, sometimes rounded, upper cell thickened above, 

 often surmounted with a pale papilla, chestnut-brown, verru- 

 cose, 38-56 X 17-28/A. Pedicels rather long, deciduous. 



Synonyf7is. 



Uredo vincce. D. C, " Flore frang.," vol. vi. p. 70. Berk., 

 " Eng. Flor.," vol. v. p. 378. 



Trichobasis vinccB, Berk. Cooke, "Micro. Fungi," 4th edit., 

 p. 226, t. vi. figs. 130, 131.' 



Puccinia vincce, Berk. Cooke, " Hdbk.," p. 497 ; " Micro. 

 Fungi," 4th edit., p. 205, t. vi. fig. 132. Winter in Rabh., 

 " Krypt. Flor.," vol. i. p. 187. 



Exsiccati. 

 Berk., 234. Cooke, i. 32 ; ii. 3, 331 ; " L. F.," 10. Vize, 

 " Micro. Fungi," 118 ; " Micro. Fungi Brit.," 29, 227. 



^cidiospores, March to May ; uredospores, May to July ; 

 teleutospores, July to October, and lasting through the winter. 



On Vinca major. 



Biology. — The life-history of this species is peculiar. The mycelium 

 of the necidiospores is perennial, and causes the affected plant to pro- 

 duce shorter and thicker leaves. The jecidia are not cups, but convex 

 or flat sori, more resembling a Coryneum than an aecidium. The 



M 



