316 I RON \i:Tll'.M 



x 1") — 20^; wall nearly colourless, smooth, 2 — 3// thick; 

 basidiospores oval. ] 



[iEcidia on branches of Pinus ;] uredo- and beleutospores on 

 leaves of Quercus pedunculata. Rare; Hastings, St Leonards, 

 Sin iv. Eursl aceaux, Salisbury. October. (Fig. 28!).) 



(>nlv the uredosporea have been found in this country, and usually so 



als the continent. The aecidia have been found in the United States 



on five species of Pinus, .is well aa 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 (I.e.). The 

 uredospores seem to be most common on the leaves of the shoots thai 

 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. 



DISTRIBUTION: 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, 133, 137, 501 ; xiii. 425; xxiii. 202, 211: 



xxvi. 72-3, 94. Arthur, N. Amor. Fl. vii. 122. 

 Peridermium Strobi Kleb. Abhandl. Nat. Ver. Bremen, x. 153, pi. 1, 



f. .-,_io, 13, 14: Zeitschr. f. Pflanzenkr. ii. 269, pi. 5, f. 1. 



Spermogones. Irregular elevations of the bark, 2 — 3 mm. 

 broad, yellow, with a minute opening through which exudes 

 a sweet fluid in which the spermatia are included; spermatia 

 ovoid to elliptical, 2 — 4^yu. 



JEcidiospores. iEciclia 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 /m; epispore 2 — 1\ \x thick, 3 — 3^/a 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 — 24x14 — 18 /J.; epispore colourless, 2 — 3^ thick. 



