CRONARTIUM 313 



As the remarkable suggested secidium-stage may possibly 

 be found in this country, it will be convenient to add here 

 the description given of it, so as to aid in its identification : 



PERIDERMIUM CONORUM-PlCEjE 



(JEcidiinii conorum-Piceae Reess.) 



^Ecidia on the outer surface of the scales, large, ±, cm. or more 



in diam., oblong or irregular in shape, 



one or two (or in any case few) on 



each scale, immersed, white ; spores 



ellipsoidal, orange, 28 — 35 x 18 — 



24 jx ; epispore with numerous, large, 



crowded, prismatic warts, each about 



3 4 „ w id e Fig. 237. P. conorum-Piceae. 



^ JEcidiospore, from scales of 



On cones of Picea eoccelsa. An- ^goo ""'" ^ FiSCher) ' 

 gust, September. In some years 

 rather common in the Alps and Jura Mountains. (Fig. 237.) 



CRONARTIUM Fries. 



Spermogones hemispherical. iEcidia with a broad, inflated, 

 irregularly torn peridium ; recidiospores with a coarsely verru- 

 cose membrane, smooth on one side, without germ-pores, 

 separated by well-marked intercalary cells. Uredo-sori enclosed 

 in a hemispherical peridium which opens at the summit by a 

 narrow pore ; uredospores produced singly, on pedicels, echinu- 

 late, without germ-pores. Teleutospores abstricted in long 

 chains, and remaining united into cylindrical columns which 

 are horny when dry, germinating as soon as mature. Basidio- 

 spores round, very minute. 



1. Cronartium asclepiadeum Fr. 



Cronartium asclepiadeum Fr. Ob.s. Myc. i. 220 (1815). Fischer, Ured. 



Schweiz, p. 431, f. 295. Sacc. Syll. vii. 597. 

 C. Paeoniae, Cast. Catal. PI. Marseill. p. 217 (1845). Cooke, Micr. 



Fung. p. 215. 



