148 British Uredinee and Ustilaginee. 
Puccinia porri. (Sow.) 
A cidiospores—Pseudoperidia in linear or circinate clusters, shortly 
cylindrical, with everted torn edges. Spores polygonal, finely 
verrucose, membrane colourless, contents orange, 19-28m 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. 
Teleutospores—Sori small, bluish grey from 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 20-26, Pedicels long, but deciduous. 
Mesospores numerous, unicellular on long deciduous pedicels, 
often irregular in form, sometimes thickened above, 22-36 x 
17-2 3p. 
Synonyms. 
Puccinia porri (Sow.). Winter in Rabh., ‘Krypt. Flor.,” 
vol. i. p. 200. 
Credo porrit. Sow., “ Eng. Fungi,” t. 411. 
Uredo alliorum, D.C. Berk., “ Eng. Flor.,” vol. v. p. 376, 
in part. Cooke, “Micro. Fungi,” 4th edit., p. 217, in’ part; 
“ Hdbk.,” p. 528. 
Uromyces alliorum. Cooke, ‘‘ Hdbk.,” p. 518 (?). 
Puccinia mixta, Fckl. Vize, Exs. 
Exsiccatt, 
Cooke, ii, 425. Vize, “Fungi Brit.” 38; “Micro. Fungi 
Brit.,” 430. 
On Allium cepa, sthenoprasum. 
May to August. 
Puccinia prenanthis. (Pers.) 
Acidiospores—Pseudoperidia in circular or elongate patches, 
hemispherical or shortly conical, opening above ‘by small 
