148 British UredinecB and Ustilaginece. 



Puccinia porri. (Sow.) 



^-Ecidiospores — Pseudoperidia in linear or circinate clusters, shortly 

 cylindrical, with everted torn edges. Spores polygonal, finely 

 verrucose, membrane colourless, contents orange, 19-28/A in 

 diameter. 



Uredospores — Sori reddish brown, scattered or in elongate clusters, 

 linear or oblong. Spores roundish, shortly elliptical, very 

 finely echinulate, orange-yellow, 20-27 X 25-30/x. 



Tcleutosporcs — Sori small, bluish grey fi-om the dark spores being 

 covered by the semitransparent epidermis. Spores clavate 

 or oblong, central constriction slight, generally attenuated 

 towards the stem, apex rounded or truncate, smooth, brown, 

 30-45 X 20-2 6/x. Pedicels long, but deciduous. 



Mesospores numerous, unicellular on long deciduous pedicels, 

 often irregular in form, sometimes thickened above, 22-36 x 

 17-23/X. 



Synonyms. 



Puccinia porri (Sow.). Winter in Rabh., " Krypt. Flor.," 

 vol. i. p. 200. 



Uredo porri. Sow., " Eng. Fungi," t. 411. 



Uredo ailiorum, D. C. Berk., " Eng. Flor.," vol. v. p. 376, 

 in part. Cooke, "Micro. Fungi," 4th edit., p. 217, in part; 

 "Hdbk.," p. 528. 



Uromyces ailiorum. Cooke, " Hdbk.," p. 518 (?). 



Puccinia mixta, Fckl. Vize, Exs. 



Exsiccati. 

 Cooke, ii. 425. Vize, " Fungi Brit.," 38 ; " Micro. Fungi 

 Brit.," 43°- 



On Allium cepa, scJmnoprasum. 

 May to August. 



Puccinia prenanthis. (Pers.) 



^^cidiosporcs — Pseudoperidia in circular or elongate patches, 

 hemispherical or shortly conical, opening above by small 



