PHRAGMIDIUM 291 
The uredospores of this species are distinguished from those of its 
allies by being densely and rather coarsely verruculose and very similar to 
the cz#oma-spores, from which, in fact, they differ almost solely in being 
abstricted singly and not in chains. The ceoma-stage is one of the earliest 
Uredines of spring, showing on the leaves as soon as they are well 
developed, and extending even to the calyx. The teleutospores are 
entirely devoid of papilla on the apical cell; the gelatinous outer coat 
is sometimes almost non-existent, and the spores are but slightly changed 
by boiling in lactic acid. 
DisTRIBUTION: Europe. 
2. Phragmidium Potentille Karst. 
Puceinia Potentiliae Pers. Syn. p. 229. 
Phragmidium Potentillae Karst. Fung. fenn. iv. 49. Plowr. Ured. 
p. 221. Fischer, Ured. Schweiz, p. 410, f. 286. Sacc. Syll. vii. 
743, McAlpine, Rusts of Australia, p. 188 (2). Arthur, N. Amer. 
Fl. p. 174. Sydow, Monogr. iii. 97. 
Spermogones. Few, amphigenous, surrounded by the ecidia. 
Aicidiospores. Czomata as in P. Fragariastri. 
Fig. 220. Ph. Potentillae. a, teleutospore x 360; b, the same x 600; c¢, the 
same, boiled in lactic acid for one minute; d, a four-celled teleutospore, 
boiled and distorted by pressure. 
Uredospores. Sori hypophyllous, roundish, often confluent, 
at first covered by the swollen epidermis, surrounded by abun- 
* Ke, * . > 
* dant, clavate, curved paraphyses; spores ellipsoid to obovate, 
finely echinulate, yellow, 21—24 x 16—19 yp. 
Teleutospores. Sori hypophyllous, orbicular, soon naked, 
19—2 
