316 CRONARTIUM 
x 15—20,; wall nearly colourless, smooth, 2—3 thick; 
basidiospores oval.] 
[4écidia on branches of Pinus ;] uredo- and teleutospores on 
leaves of Quercus pedunculata. Rare; Hastings, St Leonards, 
Shere, Hurstmonceaux, Salisbury. October. (Fig. 289.) 
Only the uredogpores have been found in this country, and usually so 
also on the continent. The wcidia’ have been found in the United States 
on five species of Pinus, as well as on others in Japan; and the other 
spore-forms on at least 20 species of Quercus in various localities. The 
description (except for the uredospores) is taken from Arthur (.c.). The 
uredospores seem to be most common on the leaves of the shoots that 
spring up from the stools of felled oaks. They occur also in France and 
Switzerland in the same way. Their dimensions are smaller in this 
country than those given by Arthur. 
Distrisution: Europe, United States, Guatemala, Japan. 
3. Cronartium ribicola F. de Waldh. 
Cronartium ribicola Fisch. de Waldh. in Rab. Fung. Eur. no. 1595; 
Hedwig. xi, 182. Klebahn, Wirtsw. Rostp. p. 382. Sacc. Syll. 
vii. 598. Fischer, Ured. Schweiz, p. 433, f. 296. Gard. Chron. 
ser, 3, xi. 736; xii. 44, 183, 187, 501; sili. 425; xxiii. 202, 244; 
xxvi. 72—38, 94. Arthur, N. Amer. Fl. vii. 122. 
Peridermium Strobi Kleb, Abhandl. Nat. Ver. Bremen, x. 153, pl. 1, 
f, 5—10, 13, 14: Zeitschr. f. Pflanzenkr. ii. 269, pl. 5, f. 1. 
Spermogones. Irregular elevations of the bark, 2—3 mun. 
broad, yellow, with a minute opening through which exudes 
a sweet fluid in which the spermatia are included; spermatia 
ovoid to elliptical, 2—44 p. 
Aicidiospores. Aicidia erumpent from the bark in the form 
of a bladder, with an inflated peridium, about 1 cm. high, 
yellowish-white ; spores roundish or polygonal, coarsely verru- 
cose, except on an elongated smooth patch, orange, 22—29 x 
18—20 pw; epispore 2—24 » thick, 3—33 y at the smooth spot. 
Uredospores. Sori hypophyllous, small, pustular, forming 
orbicular groups 1—5 mm. across, surrounded by a delicate 
peridium which opens at the summit with a pore; spores 
ellipsoid to obovoid, distantly and sharply echinulate, orange, 
21—24 x 14—18 uw; epispore colourless, 2—3 w thick. 
